CSLB General Building (B) — All Questions

A surgical case has just ended and the scrub person is preparing instruments for transport to the decontamination area. What is the correct point-of-use treatment?

• a.Remove gross soil and keep the instruments moist until they reach decontamination✓
• b.Allow the instruments to air dry so blood flakes off during transport
• c.Spray the instruments with saline and wrap them in a dry towel
• d.Perform a full manual wash at the sterile field before transport

Point-of-use treatment means wiping away gross soil and applying a moisture-retention product or damp towel so bioburden does not dry onto surfaces. Dried blood and protein are far harder to remove and can block sterilant contact. Saline is corrosive to instrument alloys, and full cleaning is never performed in the operating room because it creates contaminated aerosols in a sterile environment.AAMI ST79

A new employee asks why the department never uses saline to soak or moisten soiled surgical instruments. What is the correct explanation?

• a.It neutralizes enzymatic detergent and stops protein breakdown
• b.The chloride ions attack the passive layer and cause pitting and corrosion✓
• c.It raises the pH of the soak bath above the safe range for stainless steel
• d.It coagulates protein soil onto the instrument surface

Sodium chloride breaks down the chromium oxide passive layer that protects stainless steel, producing pitting, staining, and eventual instrument failure. Water with an appropriate presoak or enzymatic product is the correct choice. Protein coagulation is caused by heat, not saline, and pH shift is not the mechanism of chloride damage.AAMI ST79

What air pressure relationship should the decontamination area have compared with adjacent areas of the department?

• a.Positive pressure, so clean air is pushed toward the soiled workroom
• b.Equal pressure, so no air movement occurs between rooms
• c.Negative pressure, so contaminated air does not flow into clean areas✓
• d.Alternating pressure controlled by the sterilizer cycle

The decontamination room is held at negative pressure so airborne contaminants and aerosols generated during cleaning are drawn out and exhausted rather than escaping into preparation, packaging, or sterile storage. Positive pressure is used in the clean workroom and sterile storage. Equal or alternating pressure would allow uncontrolled migration of contaminated air.AAMI ST79

A facility engineer is rebalancing the ventilation system and asks what minimum air exchange rate the decontamination area requires. What should the technician answer?

• a.2 air exchanges per hour
• b.4 air exchanges per hour
• c.6 air exchanges per hour
• d.10 air exchanges per hour✓

A minimum of 10 air exchanges per hour is recommended for the decontamination area to dilute and remove aerosols, chemical vapors, and odors. Four air exchanges per hour is the minimum associated with sterile storage, a much lower-risk space. Two and six exchanges per hour are below the recommended level for any active reprocessing area.AAMI ST79

A facility engineer asks what temperature range the decontamination area should be maintained within. What is the correct answer?

• a.60 to 65 degrees F (16 to 18 degrees C)✓
• b.68 to 73 degrees F (20 to 23 degrees C)
• c.75 to 80 degrees F (24 to 27 degrees C)
• d.Any temperature that staff find comfortable in personal protective equipment

The decontamination area is kept cooler, roughly 60 to 65 degrees F, because staff work in full impervious personal protective equipment and the cooler air limits heat stress and microbial growth. The 68 to 73 degrees F range applies to the preparation and packaging area. Storage areas should not exceed about 75 degrees F, and comfort alone is not an acceptable engineering control.AAMI ST79

During a survey, an inspector reviews the department's daily environmental logs and asks what relative humidity range must be maintained in the work areas. What is correct?

• a.10 to 25 percent
• b.30 to 60 percent✓
• c.65 to 80 percent
• d.Humidity does not need to be monitored in decontamination

Relative humidity of roughly 30 to 60 percent limits microbial growth and static electricity while protecting packaging materials from moisture damage. Very low humidity dries out wrappers and generates static; humidity above 60 percent supports microbial proliferation and can cause packaging and stored items to absorb moisture. Humidity must be monitored and documented in all reprocessing areas, including decontamination.AAMI ST79

A technician is about to begin manual cleaning at an open sink where splashing is expected. Which personal protective equipment combination is required?

• a.Gloves and a surgical mask only
• b.A cloth lab coat, gloves, and eyeglasses
• c.Fluid-resistant gown, general-purpose utility gloves, face mask with eye protection or a full face shield, and hair covering✓
• d.A sterile gown and sterile gloves, because the instruments are contaminated

OSHA requires personal protective equipment that prevents blood or other potentially infectious material from reaching skin, mucous membranes, or street clothes, which at a decontamination sink means a fluid-resistant gown, heavy utility gloves, face and eye protection, and hair covering. Personal eyeglasses are not eye protection because they lack side and splash shielding. Sterile attire is irrelevant in decontamination, where the goal is worker protection, not product protection.OSHA 29 CFR 1910.1030

A technician is orienting a student at the ultrasonic cleaner and is asked what actually removes the soil from the instruments. What is the correct answer?

• a.Thermal disinfection at the final rinse temperature
• b.Chemical oxidation of protein by the detergent
• c.High-velocity water jets directed at instrument surfaces
• d.Cavitation, in which microscopic bubbles form and implode against instrument surfaces✓

High-frequency sound waves create low-pressure zones where tiny bubbles form and then collapse, and the energy released by that implosion dislodges fine soil from crevices, box locks, and serrations. Thermal disinfection and spray-jet impingement are mechanisms of washer-disinfectors, not ultrasonic units. Detergent assists cavitation but is not itself the cleaning action.AAMI ST79

An ultrasonic cleaner has just been filled with fresh solution at the start of the shift. Why must the unit be degassed before instruments are processed?

• a.Dissolved air in fresh solution cushions the sound waves and prevents effective cavitation✓
• b.Degassing raises the solution to the required thermal disinfection temperature
• c.Degassing removes residual detergent from the previous shift
• d.Degassing sterilizes the solution so instruments leave the unit sterile

Fresh water holds dissolved gas that absorbs ultrasonic energy and dampens bubble formation, so the unit is run empty for several minutes to drive the gas out and restore full cavitation. Degassing is not a heating, rinsing, or sterilizing step. An ultrasonic cleaner never sterilizes; it is a cleaning device only.AAMI ST79

A technician loads a mixed basket of stainless steel clamps, chrome-plated retractors, and aluminum instruments into the ultrasonic cleaner. What is the problem with this load?

• a.The basket exceeds the maximum weight rating of the transducer
• b.Mixing dissimilar metals in the same ultrasonic bath can cause electrolytic corrosion and plating transfer✓
• c.Aluminum instruments cannot be cleaned by any mechanical method
• d.Chrome-plated instruments must be processed in the ultrasonic twice

When different metals sit in the same conductive bath, ions migrate between them and produce staining, etching, and plating deposits, so instruments should be sorted by metal type. Aluminum can be mechanically cleaned when a compatible neutral or low-alkaline detergent is used. Weight rating and double processing are not the concerns raised by a mixed-metal load.AAMI ST79

A technician fills the wash sink with very hot water to speed up cleaning. Why must manual cleaning water stay below approximately 140 degrees F (60 degrees C)?

• a.Higher temperatures cause the detergent to foam excessively and overflow the sink
• b.Higher temperatures make it impossible to see instruments below the water line
• c.Heat above that point coagulates protein soil and bonds it to the instrument surface✓
• d.Higher temperatures deactivate the chlorides that dissolve blood

Protein denatures and coagulates with heat, so hot water effectively bakes blood and tissue onto instruments and makes removal much harder. Enzymatic detergents also lose activity outside the temperature window on the label. Foaming, visibility, and chloride activity are not the reason for the temperature limit.AAMI ST79

Most instrument manufacturers specify a neutral pH detergent for routine cleaning. What pH range is considered neutral?

• a.pH 1 to 4
• b.pH 4 to 6
• c.pH 9 to 11
• d.pH 6 to 8✓

Neutral detergents fall roughly between pH 6 and 8 and are the safest choice for the widest range of instrument materials, including anodized aluminum and delicate coatings. Strongly acidic products near pH 1 to 4 are reserved for removing mineral scale and rust deposits, and highly alkaline products near pH 9 to 11 attack aluminum and certain finishes even though they cut heavy soil. Selection must always follow the device manufacturer instructions for use.AAMI ST79

A washer-disinfector is being validated and the question arises about which water quality is required for the final rinse. What is correct?

• a.Critical water, which has been treated to remove minerals, ions, and endotoxins✓
• b.Utility water straight from the municipal tap
• c.Softened water only, with no additional treatment
• d.Distilled water heated to at least 180 degrees F but not otherwise treated

Critical water is extensively treated by processes such as reverse osmosis or deionization so that the final rinse does not deposit minerals, ions, or endotoxin residues on devices that will contact sterile tissue. Utility water is acceptable for flushing, washing, and initial rinsing but leaves residues on the final product. Softening alone removes hardness ions but not the full range of contaminants, and temperature does not substitute for treatment.AAMI ST79

A technician is scrubbing a hinged instrument with a brush at the decontamination sink and is spraying water droplets into the air. What is the correct technique?

• a.Brush more slowly under a running faucet so droplets fall back into the sink
• b.Keep the instrument and the brush fully submerged beneath the water surface while brushing✓
• c.Brush above the water line so soil is visible and can be rinsed away immediately
• d.Substitute a high-pressure water gun for the brush at all times

Brushing under the surface of the water contains splash and prevents the release of contaminated aerosols that expose the worker and the room air. Working above the water line, even slowly under a faucet, still generates droplets. Pressurized water guns have their place for lumens but must be used with additional splash protection and do not replace submerged brushing.AAMI ST79

What is the purpose of the elevated-temperature rinse phase, often around 180 degrees F or higher, in a washer-disinfector cycle?

• a.It sterilizes the instruments so they can bypass terminal sterilization
• b.It activates the enzymatic detergent so proteins continue to break down
• c.It provides thermal disinfection that reduces microbial load and improves drying✓
• d.It cools the load gradually to prevent thermal shock to delicate instruments

The hot rinse delivers thermal disinfection, lowering the bioburden so items can be safely handled in the clean workroom, and the residual heat helps the load dry. Thermal disinfection is not sterilization, so terminal sterilization is still required for critical devices. Enzymes are destroyed at that temperature, and the phase heats rather than cools the load.AAMI ST79

A department is writing its quality plan and must set a frequency for cleaning verification testing of its mechanical washers. What should the plan specify?

• a.Only when a visible soil complaint is reported by the operating room
• b.Once per quarter, at the same time as preventive maintenance
• c.Once per month, at the start of the month
• d.At least weekly, and preferably each day the washer is used✓

Routine cleaning verification with a commercial soil test device confirms the washer is still removing soil, and the recommendation is at least weekly with daily testing preferred. Waiting for a complaint is reactive and allows contaminated devices to reach patients. Quarterly and monthly intervals are too infrequent to catch a spray arm blockage, pump failure, or chemical delivery problem in time.AAMI ST79

A new sterile processing department is being designed. Which statement describes correct workflow?

• a.Work flows in one direction only, from soiled receiving through decontamination to clean assembly, sterilization, and storage✓
• b.Clean and soiled items may share a corridor as long as they travel at different times of day
• c.Staff may move freely between decontamination and assembly as long as gloves are changed
• d.Sterilizer loading may occur from either the clean or the soiled side depending on staffing

Unidirectional flow with physical separation between soiled and clean areas is the fundamental design principle that prevents recontamination of processed items. Time separation on a shared corridor does not remove residual contamination or airborne risk. Moving between areas requires full removal of protective attire and hand hygiene, not just a glove change, and sterilizers are always loaded from the clean side.AAMI ST79

Soiled instruments must be transported from the operating room to the decontamination area on a different floor. What is required?

• a.An open cart covered with a clean sheet and moved by the fastest route
• b.A closed or covered leak-proof container or cart labeled with a biohazard symbol or color coded✓
• c.A rigid sterilization container with the filters removed for ventilation
• d.Sealed plastic bags placed inside a food-service transport cart

OSHA requires contaminated items to be transported in containers that prevent leakage and are labeled or color coded so anyone encountering them knows the contents are biohazardous. A cloth sheet is not leak proof and does not warn other staff. Sterilization containers are not soiled-transport containers, and mixing biohazard transport with food-service equipment is prohibited.OSHA 29 CFR 1910.1030

A decontamination area is equipped with three sinks. What is the intended use of each?

• a.Soak, sterilize, and dry
• b.Rinse, disinfect, and lubricate
• c.Wash, intermediate rinse, and final rinse✓
• d.Presoak, ultrasonic, and inspection

The standard three-sink configuration separates the wash bath from an intermediate rinse and then a final rinse, usually with treated water, so detergent and loosened soil are not carried forward onto clean items. Sterilization, disinfection, and lubrication never take place in a decontamination sink. Ultrasonic cleaning and inspection are done in dedicated equipment and areas, not in the sink bays themselves.AAMI ST79

A lumened suction instrument arrives in decontamination. Which cleaning practice is correct?

• a.Soak the device for one hour and rely on the soak to clear the lumen
• b.Run the device through the ultrasonic cleaner only, since brushes cannot reach the channel
• c.Flush the lumen with a high-pressure air gun before any liquid contacts the device
• d.Flush the channel with detergent solution and brush it with a brush of the correct diameter and length, then rinse thoroughly✓

Lumens require mechanical action delivered by a brush that actually contacts the internal wall along the full channel length, followed by thorough flushing and rinsing. A brush that is too small does not touch the walls and one that is too large cannot pass. Soaking alone, ultrasonic alone, or blowing air through a dry contaminated channel will not remove adherent biofilm and soil.AAMI ST79

Instrument sets are consistently arriving in decontamination with hard, dried blood in box locks and serrations. What is the most likely root cause?

• a.Point-of-use treatment is not being performed and the sets sit too long before processing✓
• b.The washer-disinfector detergent concentration is set too high
• c.The decontamination area humidity is above 60 percent
• d.The transport carts are being covered too tightly

Dried, baked-on soil is the classic signature of missing point-of-use treatment combined with delayed transport, and the fix is education of the procedural areas plus prompt pickup. Excess detergent does not create dried soil, and it would be observed after washing rather than on arrival. High humidity would tend to keep soil moist, and covering carts protects rather than harms the instruments.AAMI ST79

A technician keeps a covered coffee cup on a shelf above the decontamination sink. How should this be addressed?

• a.It is acceptable because the cup has a lid and is not on the work surface
• b.It is prohibited because eating, drinking, and storing food or drink are not allowed where occupational exposure occurs✓
• c.It is acceptable if the technician removes gloves before drinking
• d.It is prohibited only if the cup is within the splash zone of the sink

OSHA bans eating, drinking, smoking, applying cosmetics, handling contact lenses, and storing food or drink in any area where occupational exposure to blood or other potentially infectious material is reasonably anticipated. A lid does not protect against contaminated aerosols settling on the exterior of the container. Glove removal and distance from the sink do not create an exemption.OSHA 29 CFR 1910.1030

Instruments are coming out of the washer with a chalky white film. Water testing shows high hardness. What is the appropriate corrective action?

• a.Increase the alkaline detergent concentration to dissolve the film
• b.Extend the wash phase by ten minutes on every cycle
• c.Address water quality with treatment such as softening or deionization, and use a descaling product as directed for existing deposits✓
• d.Lower the final rinse temperature so minerals stay in solution

A white chalky film is mineral scale from hard water depositing during rinsing and drying, and the durable fix is treating the water supply, with an acidic descaler used per manufacturer instructions to remove existing buildup. Adding alkaline detergent does not dissolve mineral scale and risks damaging aluminum. Longer wash times and cooler rinses do not change the mineral content of the water.AAMI ST79

An enzymatic cleaner label lists protease, lipase, and amylase. What does this combination indicate?

• a.The product will disinfect as well as clean
• b.The product is intended for use only in ultrasonic cleaners
• c.The product can be used at any temperature without losing effectiveness
• d.The product targets several soil types, breaking down protein, fat, and starch or carbohydrate residues✓

Each enzyme acts on a specific substrate, so protease attacks protein such as blood and tissue, lipase attacks fatty deposits, and amylase attacks starches and carbohydrates. Enzymatic cleaners clean but do not disinfect or sterilize. They are used in sinks and mechanical equipment alike, and their activity is temperature dependent and destroyed by hot water.AAMI ST79

A technician finishes cleaning and is about to walk into the clean assembly area. What must occur?

• a.Remove all personal protective equipment in the decontamination area, dispose of or store it properly, and perform hand hygiene before entering✓
• b.Keep the gown on but remove gloves, since the gown protects the clean area
• c.Walk through quickly while holding the door with an elbow to avoid touching surfaces
• d.Change gloves only, because the rest of the attire has not touched instruments

Protective attire worn in decontamination is considered contaminated and must be removed before leaving the area, followed by hand hygiene, so contamination is not carried into the clean workroom. A worn gown is a contaminated item, not a barrier that protects clean space. Speed and elbow technique do not remove contamination from attire or hands.OSHA 29 CFR 1910.1030

A case cart cannot be picked up for several hours because of staffing. What is the best interim measure for the soiled instruments?

• a.Immerse the entire set in a covered basin of tap water until pickup
• b.Apply an instrument pre-treatment foam, spray, or moisture-retaining product per the manufacturer instructions and keep the set covered✓
• c.Wrap the set in a saline-dampened towel
• d.Place the set in a warming cabinet so soil stays soft

Pre-treatment products are designed to hold moisture against the soil for extended periods and prevent it from drying, which preserves cleanability during unavoidable delays. Full immersion in open basins creates heavy containers, splash risk, and possible corrosion, and standing water can support microbial growth. Saline damages instruments, and heat accelerates drying and can coagulate protein.AAMI ST79

Why should the lid of an ultrasonic cleaner remain closed while the unit is running?

• a.To maintain the water temperature required for thermal disinfection
• b.To prevent the detergent from evaporating and changing concentration
• c.To contain the contaminated aerosols that the cavitation process releases into the air✓
• d.To keep instruments from floating out of the basket

Cavitation drives contaminated droplets off the solution surface, so keeping the lid closed protects staff and the room air from aerosolized bioburden. Ultrasonic cleaners do not perform thermal disinfection. Evaporation and floating instruments are minor operational issues, not the safety-driven reason for the closed lid.AAMI ST79

During a competency review, a technician is asked to explain why cleaning is considered the single most important step in instrument reprocessing. Which answer is correct?

• a.Cleaning removes the need for a chemical indicator inside the package
• b.Cleaning is what actually kills the spores present on the instrument
• c.Cleaning is required only for instruments that will be used on sterile tissue
• d.Residual soil shields microorganisms from the sterilant, so an item that is not clean cannot be reliably sterilized✓

Blood, tissue, and biofilm form a physical barrier that sterilant cannot penetrate, so any organism protected under residual soil may survive a technically correct sterilization cycle. Cleaning itself does not kill spores; it removes and reduces bioburden so the sterilant can work. Indicators monitor the process and cannot compensate for poor cleaning, and every reusable device requires cleaning regardless of its Spaulding classification.AAMI ST79

What is the fundamental difference between a gravity displacement cycle and a dynamic-air-removal (prevacuum) cycle?

• a.Gravity relies on incoming steam to push air down and out the drain, while dynamic-air-removal uses vacuum pulses to actively pull air out before steam is admitted✓
• b.Gravity operates at a lower temperature than any dynamic-air-removal cycle
• c.Gravity uses saturated steam and dynamic-air-removal uses dry heat
• d.Gravity requires a biological indicator while dynamic-air-removal does not

In a gravity cycle, steam entering the chamber displaces cooler, heavier air downward through the drain, which is slower and less reliable for porous items and lumens. Dynamic-air-removal cycles mechanically evacuate air with vacuum pulses or steam flushes so steam contacts every surface almost immediately. Both cycles use saturated steam, both are monitored with biological indicators, and both can run at 270 degrees F.AAMI ST79

A wrapped instrument set is being sterilized in a dynamic-air-removal steam sterilizer at 270 degrees F (132 degrees C). What is the typical minimum exposure time?

• a.1 minute
• b.4 minutes✓
• c.15 minutes
• d.30 minutes

Four minutes at 270 degrees F is the commonly validated exposure time for wrapped goods in a dynamic-air-removal cycle because air is removed before the exposure phase begins. Fifteen minutes at 270 degrees F and thirty minutes at 250 degrees F are gravity cycle parameters, which take longer because air removal is passive. One minute is not a validated exposure time for any wrapped steam cycle, and the device manufacturer instructions always govern the final selection.AAMI ST79

What is a standard gravity displacement steam cycle for a wrapped instrument set at 250 degrees F (121 degrees C)?

• a.3 minutes
• b.10 minutes
• c.30 minutes✓
• d.60 minutes

At the lower temperature of 250 degrees F, a gravity cycle needs about 30 minutes of exposure to achieve the required lethality, plus drying time. Shorter exposures of 3 or 10 minutes do not deliver sufficient lethality at that temperature for a wrapped set. Sixty minutes exceeds the validated requirement and unnecessarily stresses instruments; time and temperature are inversely related, so higher temperature permits shorter exposure.AAMI ST79

A technician opens the department at the start of the day shift and must schedule the Bowie-Dick test for a dynamic-air-removal sterilizer. How often is the test required?

• a.Once per week, on the same day each week
• b.In every load that contains an implant
• c.Only after a repair to the vacuum pump
• d.Each day the sterilizer is used, in the first cycle of the day after the warm-up cycle✓

The Bowie-Dick test verifies air removal and steam penetration and is run daily in an otherwise empty chamber before the first processed load, typically after a warm-up cycle. It is an air-removal test, not a lethality test, so it does not belong in implant loads and does not replace biological monitoring. It is also repeated after repairs, but that is in addition to, not instead of, the daily requirement.AAMI ST79

A Bowie-Dick test sheet comes out of the sterilizer with a pale, uneven center and darker edges. What does this indicate and what should be done?

• a.Incomplete air removal; the sterilizer should not be used for patient loads until the problem is corrected and a passing test is obtained✓
• b.A normal result caused by the density of the test pack; the sterilizer may be used
• c.Excessive steam pressure; reduce the set point and continue processing
• d.A failed biological indicator; quarantine all implants processed that week

Uneven or lighter color change, especially in the center, means residual air remained in the pack and steam did not penetrate uniformly, which points to an air leak, a faulty vacuum pump, or a plugged drain. The sterilizer must be taken out of service for patient loads until the cause is found and a passing test is achieved. A non-uniform result is never normal, and the Bowie-Dick test measures air removal rather than pressure or microbial kill.AAMI ST79

After a tray fails its internal chemical indicator, the supervisor reviews the fundamentals with the team. Which four parameters must all be satisfied for steam sterilization to be effective?

• a.Pressure, humidity, load weight, and cycle number
• b.Time, temperature, moisture in the form of saturated steam, and direct contact with all surfaces✓
• c.Vacuum depth, drying time, cooling time, and package integrity
• d.Detergent, water quality, temperature, and packaging material

Steam sterilization depends on saturated steam reaching every surface at the required temperature for the required time, which is why cleaning, correct packaging, and proper loading matter so much. Pressure is only the means of achieving the temperature, not an independent parameter. Drying, cooling, and cleaning variables affect the outcome and package integrity but are not the four critical parameters of the sterilization process itself.AAMI ST79

Why is saturated steam, rather than superheated or wet steam, required for steam sterilization?

• a.Superheated steam is too cold to kill spores
• b.Wet steam carries more heat energy and therefore sterilizes faster
• c.Saturated steam gives up its latent heat on contact with cooler surfaces, and both superheat and excess moisture disrupt that heat transfer✓
• d.Only saturated steam can pass through a sterilization wrapper

Sterilization depends on condensation, which releases latent heat directly onto the item surface, and saturated steam near 97 percent dryness delivers that transfer efficiently. Superheated steam behaves like hot dry air and requires far longer exposure times, while wet steam carries excess water that causes wet packs and reduced penetration. Steam of any quality can physically pass through a wrapper, so that is not the distinguishing factor.AAMI ST79

Peel pouches are being loaded onto a sterilizer shelf. What is the correct placement?

• a.Stacked flat, paper side up, no more than ten deep
• b.Stacked flat, plastic side up, so condensate runs off the film
• c.Laid flat and overlapping to maximize the number of pouches per shelf
• d.Positioned on edge in a rack, paper surface facing the plastic surface of the next pouch✓

Placing pouches on edge with paper facing plastic lets steam enter through the porous paper and lets condensate drain away, which also improves drying. Stacking pouches flat traps air and moisture between them and blocks the porous side. Overlapping pouches likewise prevents steam contact and is a common cause of wet packs and failed indicators.AAMI ST79

A mixed load contains wrapped metal basin sets and textile packs. How should the load be arranged?

• a.Place metal and basin items on the lower shelves and textile packs on the upper shelves✓
• b.Place textile packs on the bottom so metal weight does not crush them
• c.Alternate metal and textile items on every shelf for even heat distribution
• d.Place all items on a single shelf so the load remains compact

Condensate forms on and drips from metal items, so putting them low keeps that moisture off absorbent textile packs and prevents wet packs. Placing textiles beneath metal is the classic cause of soaked wrappers. Alternating or compacting the load restricts steam circulation and creates cold spots, and items should never be packed tightly against each other or the chamber walls.AAMI ST79

A tray is removed from the sterilizer and the outer wrapper feels damp to the touch. What is the correct action?

• a.Set the tray aside until the moisture evaporates, then send it to storage
• b.Consider the package contaminated, do not use or store it, and reprocess the contents after investigating the cause✓
• c.Wipe the wrapper dry with a clean lint-free towel and release the tray
• d.Place the tray back in the sterilizer for an additional drying cycle and then release it

Moisture provides a wicking pathway for microorganisms from the outer surface to the contents, so a wet pack is considered contaminated regardless of whether the cycle parameters were met. The contents must be rewrapped and reprocessed, and the cause must be investigated. Air drying, wiping, or re-running only the drying phase does not restore sterility to a package that has already wicked.AAMI ST79

Wet packs are appearing intermittently across several loads. Which of the following is the least likely cause?

• a.Overloading the chamber or packing items too densely
• b.Insufficient drying time or opening the door too early
• c.Using a dynamic-air-removal cycle instead of a gravity cycle✓
• d.Poor steam quality with excess moisture in the supply line

Dynamic-air-removal cycles generally dry better than gravity cycles because the post-cycle vacuum helps pull moisture out, so cycle type is not a likely cause of wet packs. Overloading, dense packing, short drying times, premature door opening, clogged drains, faulty steam traps, and wet incoming steam are all recognized contributors. Cooling loads on a cold metal surface or in a drafty area also produces condensation.AAMI ST79

After a steam cycle finishes and the load is removed, how should the load be handled?

• a.Transferred immediately to sterile storage to protect it from room air
• b.Placed on a solid countertop and covered with a clean towel while it cools
• c.Unloaded and immediately handled by staff wearing clean gloves
• d.Left undisturbed on the cart in a low-traffic, draft-free area until fully cool, typically 30 minutes or longer, before it is touched or moved✓

Hot packages are vulnerable because handling them can drive condensation and contamination through the packaging, so the load is left to cool on the cart away from vents, drafts, and traffic. Cooling times of 30 minutes to an hour or more are common depending on load density. Placing hot items on a cold solid surface or covering them traps condensate, and gloves do not protect a package that is still hot and damp.AAMI ST79

Immediate-use steam sterilization (IUSS) is requested for a single dropped instrument during a case. Which statement is correct?

• a.The item must still be thoroughly cleaned and decontaminated before it is placed in the sterilizer✓
• b.Cleaning may be abbreviated because the exposure temperature is higher
• c.The item may be flash sterilized unwrapped and stored for later use if kept covered
• d.IUSS eliminates the need for physical, chemical, and biological monitoring

IUSS shortens the packaging and drying steps, not the cleaning step, and a device that is not properly cleaned cannot be sterilized by any cycle. Items processed by IUSS are transported for immediate use and are not stored for later cases. Physical monitors and chemical indicators are used with every IUSS cycle, and the sterilizer is monitored biologically at least daily or weekly per policy.AAMI ST79

Which practice regarding IUSS and implants is correct?

• a.Implants may be routinely processed by IUSS as long as the case is urgent
• b.IUSS of implants should be avoided; if unavoidable in a documented emergency, a rapid-readout biological indicator with a Class 5 integrating indicator is run and the event is documented✓
• c.Implants may be processed by IUSS if a Class 1 process indicator is placed on the tray
• d.Implants processed by IUSS require no biological monitoring because the cycle is unwrapped

Because a failed implant sterilization carries severe patient consequences, implants should be sterilized in a full terminal cycle and quarantined until the biological indicator result is known. In a documented emergency, IUSS may be used with a process challenge device containing a rapid-readout biological indicator and a Class 5 integrating indicator, and the exception must be recorded. Convenience or urgency alone does not justify the practice, and an external process indicator only shows exposure.AAMI ST79

A typical IUSS gravity cycle for nonporous metal instruments only is 270 degrees F (132 degrees C) for 3 minutes. What changes when the item is porous, cannulated, or has a lumen?

• a.The temperature is lowered to 250 degrees F and the time stays at 3 minutes
• b.The cycle is unchanged because IUSS parameters are fixed
• c.A longer exposure, commonly 10 minutes in a gravity cycle, is required per the device manufacturer instructions✓
• d.The item cannot be sterilized by steam under any circumstance

Porous items, lumens, and complex devices are harder for steam to penetrate, so validated IUSS parameters extend the exposure time, commonly to 10 minutes in a gravity cycle. The device manufacturer written instructions for use always define the required cycle. Lowering the temperature reduces lethality, IUSS parameters are not fixed across device types, and most such devices are perfectly steam compatible.AAMI ST79

A surgeon sends a heat-sensitive device with a long narrow lumen and asks whether it can be processed with ethylene oxide. Which statement describes ethylene oxide sterilization?

• a.A high-temperature method used as the fastest option for routine metal instruments
• b.A liquid immersion method used at the point of use for endoscopes
• c.A dry heat method used for oils, powders, and petroleum-based products
• d.A low-temperature gas method used for heat-sensitive and moisture-sensitive devices, including many long or narrow lumens✓

Ethylene oxide sterilizes at low temperature and penetrates well, which makes it valuable for delicate electronics, plastics, and devices with long narrow lumens that other low-temperature methods cannot handle. Its drawbacks are a long total cycle including mandatory aeration and significant worker safety and environmental controls. Dry heat is the method used for oils and powders, and liquid chemical sterilants are the point-of-use immersion option.AAMI ST79

Why must every ethylene oxide load undergo an aeration phase before items are released?

• a.Residual ethylene oxide absorbed into plastics and rubber is toxic and must be driven off to protect patients and staff✓
• b.Aeration completes the microbial kill that the exposure phase started
• c.Aeration restores the humidity that was removed during the cycle
• d.Aeration is required only for loads that contain implants

Ethylene oxide is a recognized carcinogen and irritant that is absorbed by polymers, so mechanical aeration at elevated temperature is required to reduce residuals to safe levels before handling or patient contact. Aeration times of about 8 to 12 hours or more are typical and are set by the device and sterilizer manufacturers. The kill occurs during exposure, not aeration, and the requirement applies to every load regardless of contents.OSHA

A tray wrapped in a cellulose-based (paper) wrapper is about to be loaded into a hydrogen peroxide gas plasma sterilizer. What is the problem?

• a.Cellulose reacts with hydrogen peroxide to form a toxic residue on instruments
• b.Cellulose absorbs hydrogen peroxide and will cause the cycle to abort or fail, so only nonwoven polypropylene wrap and compatible trays may be used✓
• c.Cellulose wrap melts at the operating temperature of the sterilizer
• d.Cellulose wrap is acceptable if a second wrapper is applied over it

Hydrogen peroxide is readily absorbed by cellulose materials such as paper, linen, and cotton, which strips sterilant from the chamber and causes cycle cancellation, so only polypropylene wrap, compatible pouches, and approved containers are used. The issue is absorption, not toxic residue formation or melting, since the process runs at low temperature. Adding a second cellulose layer makes the absorption problem worse.AAMI ST79

What are the byproducts of a hydrogen peroxide gas plasma sterilization cycle, and what does this mean operationally?

• a.Ethylene glycol and chlorohydrin, which require a long aeration phase
• b.Formaldehyde and methanol, which require a chemical scrubber
• c.Water vapor and oxygen, so no aeration period is required and items can be used immediately after the cycle✓
• d.Ozone and nitrogen, which require ventilation of the room for one hour

Hydrogen peroxide breaks down into water and oxygen, so there is no toxic residual and loads are available for immediate use, which is a major advantage over ethylene oxide. Ethylene glycol and ethylene chlorohydrin are ethylene oxide byproducts that drive its aeration requirement. Formaldehyde and ozone are separate sterilization agents, not plasma byproducts.AAMI ST79

An ozone sterilization system is being introduced. Which statement about ozone sterilization is accurate?

• a.Ozone is generated from ethylene oxide and requires the same aeration as EO
• b.Ozone sterilizes at 270 degrees F and can replace steam for textile packs
• c.Ozone is used primarily for oils, powders, and anhydrous materials
• d.Ozone is generated on demand from oxygen and water, sterilizes at low temperature, and reverts to oxygen with no toxic residue✓

Ozone sterilizers create the sterilant on site from medical-grade oxygen and water, which removes the need for stored chemical cartridges, and the ozone converts back to oxygen at the end of the cycle. It is a low-temperature method for heat-sensitive and moisture-sensitive devices, not a steam substitute for textiles. Dry heat, not ozone, is the method for oils and powders, and ozone is unrelated to ethylene oxide.AAMI ST79

A department is deciding which sterilization method to use for a heat-stable stainless steel instrument set. Which method should be selected and why?

• a.Steam, because it is the safest, fastest, least expensive, and most reliable method for heat-tolerant and moisture-tolerant items✓
• b.Ethylene oxide, because it penetrates box locks better than steam
• c.Hydrogen peroxide gas plasma, because it is the shortest cycle available
• d.Dry heat, because it does not corrode stainless steel

Whenever a device tolerates heat and moisture, steam is the preferred method because it is nontoxic, inexpensive, well validated, and rapid. Low-temperature methods are reserved for devices that cannot survive steam, and each carries material restrictions, cost, and in the case of ethylene oxide, worker safety burdens. Dry heat requires very long exposure times and is limited to a narrow set of materials.AAMI ST79

A technician receives a jar of petroleum-based lubricant and a container of powder that must be sterilized. Which method applies, and what are representative parameters?

• a.Flexible endoscopes, at 250 degrees F for 30 minutes
• b.Oils, petroleum-based lubricants, and powders, at approximately 320 degrees F for 2 hours or 340 degrees F for 1 hour✓
• c.Rigid containers with filters, at 270 degrees F for 4 minutes
• d.Textile packs, at 275 degrees F for 3 minutes

Dry heat is used for anhydrous materials that steam cannot penetrate, such as oils, ointments, and powders, and it needs long exposure at high temperature because heat transfer without moisture is inefficient. Flexible endoscopes are heat sensitive and are high-level disinfected or low-temperature sterilized. The 270 and 275 degrees F short cycles listed are steam parameters, not dry heat.AAMI ST79

Rigid sterilization containers are being loaded into a steam sterilizer along with wrapped trays. What is correct practice?

• a.Stack containers three high to conserve shelf space
• b.Place containers on the top shelf so condensate drains onto the wrapped trays below
• c.Place containers flat on the shelf, do not stack unless the container manufacturer validates stacking, and keep them from touching chamber walls✓
• d.Turn containers on edge so water drains from the filter ports

Containers must sit level so condensate can drain through the designed pathway, and stacking is permitted only when the container manufacturer has validated it, because stacking can block steam access and trap moisture. Items should never contact chamber walls, where they can be scorched or collect condensate. Putting containers above absorbent wrapped packs invites wet packs, and turning them on edge defeats the drainage design.AAMI ST79

A technician notices the sterilizer printout shows the chamber reached only 268 degrees F during a cycle set for 270 degrees F, although the chemical indicator changed color. What should be done?

• a.Release the load, since the chemical indicator confirms sterility
• b.Release the load but note the discrepancy in the log for the next preventive maintenance visit
• c.Rerun the same load in the same sterilizer without further investigation
• d.Do not release the load; the physical monitor shows the cycle parameters were not met, so the load is quarantined and the sterilizer is evaluated✓

Physical monitors are an independent record of what the chamber actually did, and a load that did not meet its specified parameters cannot be released even if an indicator changed color. Chemical indicators respond to conditions but do not prove that all critical parameters were achieved. Rerunning without investigation ignores a possible equipment fault that will affect subsequent loads.AAMI ST79

Why must instruments with hinges, such as hemostats, be placed in the sterilizer in the open, unlocked position?

• a.Steam must contact every surface, and closed box locks and ratchets shield the mating surfaces from the sterilant✓
• b.Closed instruments trap air that lowers the chamber pressure
• c.Open instruments dry faster and reduce total cycle time
• d.Closed instruments will be damaged by the pressure changes in the chamber

Sterilization requires direct sterilant contact with all surfaces, and a closed ratchet creates a shielded metal-to-metal interface that steam cannot reach. Stringers, racks, and instrument pins are used to hold hinged instruments open throughout the cycle. Chamber pressure is controlled by the sterilizer, drying benefit is secondary, and correctly manufactured instruments are not damaged by normal cycle pressure changes.AAMI ST79

A student asks a technician what it means when a process is described as achieving a sterility assurance level of 10 to the minus 6. What is the correct explanation?

• a.Six log reductions of bioburden have occurred during the cycle
• b.The probability that a single item remains nonsterile after processing is one in one million✓
• c.Six biological indicators must be run in every load
• d.The sterilant concentration is one part per million at the end of the cycle

SAL is a probability statement about the likelihood that a viable microorganism survives on a processed item, and 10 to the minus 6 is the accepted level for devices intended for sterile use. It is not a count of log reductions achieved, although the two concepts are mathematically related through the starting bioburden. It has nothing to do with the number of indicators used or with residual sterilant concentration.AAMI ST79

A technician is loading a steam sterilizer and wants to fit as many trays as possible before the shift ends. How full should the chamber be loaded?

• a.Completely full, with items packed tightly so nothing shifts during the cycle
• b.At least three quarters full, because partial loads waste energy
• c.Loosely, with space between packages and between packages and the chamber walls so steam can circulate freely✓
• d.Only with identical items, never mixed loads, regardless of spacing

Free circulation of steam and unobstructed air removal require space around every package, so overloading is a leading cause of sterilization failure and wet packs. Packing tightly or filling to a minimum percentage for efficiency compromises the process. Mixed loads are acceptable when items are arranged correctly, for example metal below textiles, and when all items share the same validated cycle.AAMI ST79

A liquid chemical sterilant such as peracetic acid is used to process a device. What is the key limitation of this method?

• a.It cannot be used on immersible devices
• b.It requires an aeration period of at least four hours
• c.It produces a package that has a two-week shelf life
• d.The device is processed wet and unwrapped, so it cannot be packaged or stored and must be used immediately✓

Liquid chemical sterilization occurs in a chamber of circulating solution and the device emerges wet, meaning there is no barrier packaging and therefore no shelf life; the item is transferred aseptically and used right away. The method is intended specifically for immersible heat-sensitive devices. No aeration phase is involved, and the absence of packaging is precisely why storage is impossible.AAMI ST79

An instrument manufacturer's instructions for use specify a prevacuum cycle at 270 degrees F for 4 minutes with an 8-minute dry time, but department policy uses a 30-minute dry time for all trays. Which should be followed?

• a.Follow the longer validated department cycle only if it is also within what the device manufacturer permits; the device manufacturer instructions for use set the required minimum parameters and must be reconciled with sterilizer capability✓
• b.Always follow department policy, because it is approved by the infection prevention committee
• c.Always use the shortest parameters listed anywhere, to protect the instruments
• d.Choose whichever parameters the operating room requests for turnaround

Reprocessing must follow the device manufacturer written instructions for use, validated against what the facility sterilizer can actually deliver, and any conflict is resolved before the device is put into service rather than by local preference. Longer drying is generally acceptable, but exposure parameters cannot be shortened below the validated minimum. Turnaround pressure and blanket policy never override validated instructions.AAMI ST79

During a steam cycle the sterilizer aborts and displays an air leak alarm. What is the correct response?

• a.Restart the same cycle immediately, since aborted cycles do not affect the load
• b.Consider the load unsterile, remove it from service, and do not release it; report the alarm so the sterilizer can be evaluated and repaired✓
• c.Release the load if the external chemical indicators have changed color
• d.Open the door and allow the load to dry, then run a Bowie-Dick test and release the load

An aborted cycle means the process was not completed as validated, so the entire load is treated as unsterile and must be reprocessed after the equipment problem is resolved. An air leak specifically means air remained in the chamber and steam penetration cannot be assumed. External indicators show only that a package was exposed to some conditions, and a Bowie-Dick test performed later says nothing about a load that already failed.AAMI ST79

Which organism is used in biological indicators for steam sterilization, and why?

• a.Geobacillus stearothermophilus, because its spores are highly resistant to moist heat✓
• b.Bacillus atrophaeus, because its spores are highly resistant to moist heat
• c.Clostridioides difficile, because it is a common healthcare pathogen
• d.Staphylococcus aureus, because it survives on dry surfaces

Biological indicators use a highly resistant spore population that is harder to kill than the microorganisms found on devices, and Geobacillus stearothermophilus fills that role for steam, hydrogen peroxide, and ozone. Bacillus atrophaeus is used for ethylene oxide and dry heat. Vegetative pathogens such as staphylococci and clinical spore formers such as C. difficile are far less resistant and are never used as process challenge organisms.AAMI ST79

A department is setting its biological monitoring policy for a steam sterilizer used for routine loads. How frequently should a biological indicator be run?

• a.Monthly, and after any repair
• b.At least daily on each day the sterilizer is used, preferably in every load, and always in loads containing implants✓
• c.Only in loads containing implants
• d.Annually, as part of preventive maintenance

Biological monitoring at least once each day of use is the minimum expectation, with every-load monitoring recommended because it narrows the recall population if a failure occurs. Implant loads always require a biological indicator in a process challenge device, and the load is quarantined until the result is read. Monthly and annual intervals leave far too many loads unverified.AAMI ST79

A Class 1 chemical indicator is applied to the outside of every wrapped tray. What does it tell the user?

• a.That all critical parameters of the cycle were met
• b.That the contents are sterile and safe for patient use
• c.That the package has been exposed to a sterilization process and distinguishes processed from unprocessed packages✓
• d.That air was successfully removed from the chamber

Class 1 process indicators, such as autoclave tape and preprinted pouch indicators, only distinguish processed from unprocessed items and do not measure whether the cycle was adequate. Confirming that all critical variables were met is the role of Class 5 integrating indicators, and air removal is verified by a Class 2 Bowie-Dick test. Sterility is never established by any single indicator.AAMI ST79

Which class of chemical indicator reacts to all critical variables of the sterilization cycle and has performance correlated to a biological indicator?

• a.Class 1, process indicator
• b.Class 3, single-variable indicator
• c.Class 4, multi-variable indicator
• d.Class 5, integrating indicator✓

Class 5 integrating indicators respond to all critical variables of the cycle and are calibrated against the stated values of the reference biological indicator, which is why they are commonly placed in process challenge devices and in implant loads alongside a biological indicator. Class 3 responds to one variable and Class 4 responds to two or more but not all. Class 1 only shows external exposure.AAMI ST79

A technician finds a box of chemical indicators labeled for use only in a cycle of 270 degrees F for 4 minutes. What type of indicator is this?

• a.An emulating indicator designed and verified for one specific cycle, reacting to all critical variables at the stated values of that cycle✓
• b.An indicator used only in ethylene oxide sterilizers
• c.An indicator that replaces the daily biological indicator
• d.An external indicator used to identify the sterilizer number

Class 6 emulating indicators are cycle specific, meaning an indicator labeled for 270 degrees F and 4 minutes may be used only for that cycle, and they respond to all critical variables at the stated values. They exist for multiple sterilization methods, not just ethylene oxide. No chemical indicator of any class replaces biological monitoring, and identifying the sterilizer is a labeling function.AAMI ST79

A supervisor asks a technician to assemble a process challenge device for the daily biological indicator test. What is a process challenge device?

• a.A device that measures chamber pressure independently of the sterilizer gauges
• b.A test assembly that presents a challenge to the sterilization process equal to or greater than the most difficult item routinely processed, containing a biological or chemical indicator✓
• c.A tray of instruments used only for training new technicians
• d.A software module that records cycle data for traceability

A PCD, such as a commercial test pack or a homemade AAMI test pack, places the indicator in the hardest-to-sterilize location so that a passing result gives confidence that easier items were also processed. The design must challenge the process at least as much as the routine load. Pressure verification, training, and electronic record keeping are separate functions unrelated to the definition of a PCD.AAMI ST79

Where should the process challenge device be placed in a steam sterilizer chamber for routine biological monitoring?

• a.On the top shelf at the rear of the chamber
• b.In the geometric center of the load, surrounded by the densest packs
• c.In the area identified as the most difficult for the sterilant to reach, typically on the bottom shelf near the front over the drain✓
• d.Outside the chamber, taped to the sterilizer door

Air is heaviest and settles low near the drain, so the front bottom of the chamber is the recognized cold spot for a steam sterilizer and is where the PCD is placed. Testing an easy location would give a falsely reassuring result. The exact placement follows the sterilizer manufacturer instructions, and an indicator outside the chamber tests nothing.AAMI ST79

Which of the following are physical monitors of a sterilization cycle?

• a.Autoclave tape and pouch indicators
• b.Spore strips and self-contained vials
• c.Integrating indicators placed inside packs
• d.Time, temperature, and pressure readings on gauges, digital displays, and cycle printouts✓

Physical monitors are the sterilizer's own instrumentation and recording output, and the operator must review and initial the printout or record for each cycle before the load is released. Tape and pouch indicators are chemical Class 1, and integrating indicators are chemical Class 5. Spore strips and vials are biological indicators.AAMI ST79

A biological indicator from this morning's steam load is positive. What is the first action?

• a.Take the sterilizer out of service and immediately recall and quarantine the items from that load and from every load back to the last negative biological indicator✓
• b.Repeat the test at the end of the shift and continue processing loads in the meantime
• c.Discard the indicator as a false positive, since spore vials are unreliable
• d.Notify the operating room that items may have been unsterile but allow already distributed items to be used

A positive biological indicator means the process cannot be assumed to have been lethal, so the sterilizer is removed from service and every load processed since the last negative result is retrieved, quarantined, and reprocessed. Continuing to run loads or waiting to retest extends the exposure to patients. Positives are investigated, not assumed to be false, and previously distributed items must be located, not released for use.AAMI ST79

After a positive biological indicator, the sterilizer is inspected, a probable cause is corrected, and testing resumes. What is generally required before the sterilizer returns to routine service?

• a.A single passing chemical indicator in a full production load
• b.Three consecutive cycles with negative biological indicators in an empty chamber, and for dynamic-air-removal sterilizers three passing Bowie-Dick tests as well✓
• c.One passing biological indicator run in a fully loaded chamber
• d.A signed statement from the operator that the load appeared normal

Requalification after a failure or a major repair uses three consecutive empty-chamber cycles with negative biological indicators, with Bowie-Dick testing added for dynamic-air-removal sterilizers, to demonstrate the equipment is reliably performing again. A chemical indicator does not demonstrate microbial lethality, and one biological indicator in a production load is not sufficient evidence of restored performance. Operator observation is not a qualification method.AAMI ST79

An implant is processed in a terminal steam cycle with a rapid-readout biological indicator. When may the implant be released?

• a.Immediately, if the Class 5 integrating indicator inside the tray has changed
• b.At the end of the shift, regardless of the biological indicator result
• c.Only after the biological indicator result is available and negative, except in a documented emergency✓
• d.Only after 48 hours of incubation, with no exceptions

Implant loads are quarantined until the biological indicator reads negative, because a failure would place a permanently implanted device in a patient. Emergency release before the result is available is permitted only when it is documented and the surgeon is informed, and the result is tracked to completion. A Class 5 indicator supports early release decisions in an emergency but does not by itself satisfy the requirement, and modern rapid-readout indicators give results in far less than 48 hours.AAMI ST79

A recall requires the department to trace every package from a suspect cycle. What information must the load record contain?

• a.Only the date and the technician initials
• b.Only the sterilizer number and the cycle type
• c.Only a list of the departments the items were sent to
• d.Sterilizer identification, cycle or load number, date and time, contents of the load, cycle parameters, operator identification, and the results of physical, chemical, and biological monitoring✓

Complete load documentation permits a targeted recall, links a specific package to a specific cycle, and demonstrates that monitoring was performed and reviewed. Each package also carries a lot control label with the sterilizer, cycle, and date so it can be matched back to the record. Partial records leave gaps that force a much broader and more disruptive recall.AAMI ST79

A nurse reports that a tray opened in the operating room contained an internal chemical indicator that did not change. What is the correct action?

• a.Do not use the tray, return it for reprocessing, and investigate the cycle records and the rest of the load✓
• b.Use the tray if the external tape changed color, since two indicators are redundant
• c.Use the tray but document the indicator failure afterward
• d.Replace the indicator and reseal the tray in the operating room

An internal indicator that failed to change means sterilant may not have reached the interior of the package, so the tray is treated as unsterile and reprocessed while the load records and remaining packages are reviewed. External tape only shows the package was exposed to a process, so it cannot override an internal failure. Resealing or using the tray and documenting later places the patient at risk.AAMI ST79

How should the daily Bowie-Dick test cycle be run?

• a.In a fully loaded chamber, to reflect real conditions
• b.In an otherwise empty chamber, in the first cycle of the day after a warm-up cycle, at 270 to 275 degrees F for the time specified by the test manufacturer, usually not exceeding 4 minutes✓
• c.In any cycle of the day, as long as the result is recorded
• d.Together with a biological indicator, so both tests share the same cycle

The Bowie-Dick test is run in an empty chamber so the only challenge to air removal is the test pack itself, and a warm-up cycle first brings the chamber and jacket to operating condition. Exposure time follows the test manufacturer instructions and is typically limited to about 3.5 to 4 minutes, because overexposure can produce a false pass. Running it in a production load or combining it with biological monitoring invalidates the intent of the test.AAMI ST79

What is the correct handling of the control biological indicator that accompanies a test lot?

• a.It is placed in the sterilizer alongside the test indicator
• b.It is discarded because it is not part of the record
• c.It is not sterilized, is incubated with the processed indicator from the same lot, and must show growth for the test to be valid✓
• d.It is stored in a refrigerator until the end of the month

The unprocessed control proves the spore population is viable and that the incubator and reading method are working, so it must turn positive while the processed indicator turns negative. If the control fails to grow, the test result is invalid regardless of what the processed indicator shows. Sterilizing the control defeats its purpose, and it must come from the same lot and be incubated at the same time.AAMI ST79

Which statement best describes the regulatory and standards landscape for sterile processing?

• a.Only the Food and Drug Administration has any authority over reprocessing practices
• b.Only state health departments set requirements for sterile processing departments
• c.Standards such as ANSI/AAMI ST79 are legally binding federal law in every state
• d.Multiple bodies apply: the FDA clears devices and their reprocessing instructions, OSHA regulates worker safety, CDC publishes guidelines, CMS and accrediting organizations survey practice, and ANSI/AAMI standards define recognized practice✓

Sterile processing sits at the intersection of device regulation, occupational safety law, public health guidance, accreditation, and voluntary consensus standards, and departments are held to all of them. ANSI/AAMI ST79 is a voluntary consensus standard rather than statute, but it is widely adopted as the standard of care and is cited by surveyors. Some states have added their own certification and staffing requirements, which supplement rather than replace federal and accreditation expectations.CDC

A sterilizer has just been relocated to a new position in the department. What testing is required before it processes patient loads?

• a.A single Bowie-Dick test on the first day of use
• b.Installation and requalification testing, including three consecutive negative biological indicator cycles in an empty chamber, plus three passing Bowie-Dick tests for dynamic-air-removal sterilizers✓
• c.No testing, because the sterilizer passed all tests before it was moved
• d.Only a leak test performed by the service technician

Relocation, installation, and major repairs all trigger full qualification testing because the utilities, leveling, and connections have changed. The accepted protocol is three consecutive empty-chamber cycles with negative biological indicators, with Bowie-Dick testing added for dynamic-air-removal units. A service leak test or a single daily test is not a substitute for qualification.AAMI ST79

A recall is initiated after a sterilization failure. Which action is part of a proper recall procedure?

• a.Retrieve only the items still on the sterile storage shelves
• b.Notify the affected departments verbally and take no further action
• c.Identify every item processed since the last negative biological indicator, retrieve and quarantine them, notify risk management and infection prevention if any were used on patients, and document the investigation and corrective action✓
• d.Reprocess the affected items and release them without documenting the event

An effective recall traces every package from the affected cycles using load records and lot control labels, pulls them from storage and from the procedural areas, and escalates when items have already been used so patient follow-up can be considered. The event, the root cause analysis, and the corrective actions are documented as part of the quality program. Limiting the search to shelf stock or skipping documentation defeats the purpose of traceability.AAMI ST79

A technician is inspecting instruments at the assembly workstation. Which tool and technique should be used?

• a.Lighted magnification, examining each instrument for cleanliness, cracks, pitting, alignment, and proper function before assembly✓
• b.A quick visual scan under overhead lighting, since the washer verifies cleanliness
• c.Testing only the instruments that were flagged by the operating room on the count sheet
• d.Wiping instruments with alcohol to reveal residual soil

Every instrument is individually inspected under lighted magnification because fine cracks, residual soil in serrations, worn tips, and misaligned jaws are not visible to the unaided eye. Mechanical cleaning reduces bioburden but does not guarantee that a specific device is clean or functional. Selective inspection and alcohol wiping are not substitutes for full item-by-item inspection and functional testing.AAMI ST79

How should the cutting performance of surgical scissors be verified during inspection?

• a.By running a fingernail along the blade edge
• b.By cutting through the appropriate test material, such as several layers of gauze or a test material specified by the manufacturer, using the distal third of the blades✓
• c.By holding the blades up to the light to check for gaps
• d.By opening and closing the scissors to check the pivot screw only

Scissors are tested by cutting a standardized material with the tips, because the distal portion of the blades is where dullness first appears and where clinical cutting failures occur. Feeling the edge is subjective and creates a sharps injury risk. Light inspection and pivot checks are useful additional steps but do not confirm cutting performance.AAMI ST79

A technician notices that a hinged instrument is stiff during inspection and asks which lubricant to apply before packaging. What is correct?

• a.A petroleum-based penetrating oil applied to hinges
• b.Silicone spray intended for industrial equipment
• c.A water-soluble, steam-penetrable instrument lubricant applied per manufacturer instructions✓
• d.No lubricant should ever be applied to instruments

Instrument lubricant, sometimes called instrument milk, is water soluble so steam can penetrate it and reach the metal surface, and it protects hinges and box locks from stiffness and corrosion. Petroleum-based oils and industrial sprays form a barrier that blocks sterilant contact and can leave toxic residues. Lubrication is a normal step for hinged instruments when the manufacturer directs it.AAMI ST79

An instrument set is being assembled. Which practice supports effective sterilization and safe handling?

• a.Lock all ratcheted instruments closed so they do not shift in the tray
• b.Nest all concave items facing upward so they hold their position
• c.Stack heavy retractors on top of delicate microsurgical instruments to keep them from moving
• d.Place hinged instruments open on a stringer, put heavy items on the bottom, protect delicate tips, and keep total set weight within recommended limits, commonly about 25 pounds✓

Correct assembly keeps hinged instruments open so steam reaches mating surfaces, distributes weight so delicate items are not crushed, and limits set weight to reduce wet packs and ergonomic injury. Concave items are positioned so condensate can drain rather than pool. Closed ratchets shield surfaces from sterilant, and stacking heavy instruments over delicate ones damages them and blocks steam.AAMI ST79

A peel pouch is being prepared for a single ring-handled instrument. Which practice is correct?

• a.Select a pouch size that lets the item fit without stressing the seals, place the item so the handle enters the pouch first, and do not double pouch unless the pouch manufacturer validates it✓
• b.Fill the pouch completely so the instrument cannot shift during handling
• c.Fold the pouch over to fit a long instrument and seal it with tape
• d.Write the contents on the paper side with a ballpoint pen

A properly sized pouch keeps the seals intact, permits steam entry through the porous side, and allows the package to be opened aseptically with the handle presented first. Overfilling stresses seals, and folding or taping a pouch prevents sterilant contact and creates an unvalidated package. Labeling is done on the plastic side, outside the seal, with a non-bleeding marker, because writing on the paper side can damage the sterile barrier.AAMI ST79

What must be verified about a rigid sterilization container each time it is used?

• a.That the container has been polished and is free of fingerprints
• b.That filters are correct, unused, and properly seated; that valves, gaskets, latches, and the lid seal are intact; and that a tamper-evident lock is applied after assembly✓
• c.That the container is completely airtight so no organisms can enter
• d.That the container weighs less than 5 pounds when empty

Rigid containers depend on intact filters, gaskets, and valves to allow sterilant in and keep contaminants out, so each of these is inspected before every use and single-use filters are replaced. A tamper-evident lock shows at the point of use that the container has not been opened since processing. Containers are deliberately not airtight, since steam must enter, and empty weight is not a use criterion.AAMI ST79

A technician is applying labels to packages as they are assembled for sterilization. What information belongs on the label of a sterilized package?

• a.The patient name and procedure date only
• b.The technician name only
• c.A lot control number identifying the sterilizer, cycle number, and date, plus a description of the contents and the identity of the person who assembled the package✓
• d.The expiration date only, with no other information

Lot control labeling is what makes recall possible, because it links a specific package back to a specific sterilizer and cycle in the load records. A contents description lets users select the right package without opening it, and assembler identification supports quality follow-up. Patient names are not applied to inventory packages, and an expiration date alone provides no traceability.AAMI ST79

A facility uses event-related sterility. What does this mean?

• a.Packages expire exactly 30 days after the sterilization date
• b.Packages must be reprocessed at the end of each month regardless of condition
• c.Packages remain sterile only while stored in a closed cabinet, and become nonsterile once moved to open shelving
• d.A package is considered sterile until an event such as moisture, a tear, a broken seal, or contaminated handling compromises the barrier, regardless of elapsed time✓

Event-related sterility recognizes that packaging integrity, handling, and storage conditions determine sterility rather than the passage of time, so staff inspect each package before use for wetness, holes, broken seals, and soiling. Time-related shelf life assigns an arbitrary expiration date and is now used mainly for products whose manufacturer specifies one. Storage furniture type affects risk and handling practice but does not by itself define the sterility approach.AAMI ST79

What temperature and humidity conditions are recommended for a sterile storage area?

• a.Temperature not exceeding about 75 degrees F (24 degrees C) and relative humidity not exceeding about 60 percent, with a minimum of 4 air exchanges per hour and positive pressure✓
• b.Temperature of 60 to 65 degrees F and 10 air exchanges per hour under negative pressure
• c.Any temperature, as long as humidity stays above 70 percent
• d.Temperature above 80 degrees F to keep packages thoroughly dry

Sterile storage is kept cool and dry under positive pressure with at least four air exchanges per hour so packaging is not degraded by heat or moisture and clean air flows outward. The 60 to 65 degrees F, 10 exchange, negative pressure profile describes the decontamination area. Humidity above 60 percent encourages microbial growth and can compromise packaging, and excessive heat damages wrappers and seals.AAMI ST79

Sterile packages are being placed on open shelving. What clearances should be maintained?

• a.At least 2 inches from the floor, 8 inches from the ceiling, and 18 inches from outside walls
• b.At least 8 to 10 inches from the floor, 18 inches from sprinkler heads, and about 2 inches from outside walls✓
• c.Flush to the wall to maximize usable shelf depth, with no floor clearance requirement
• d.At least 24 inches from the floor and 24 inches from the ceiling

Bottom shelves are raised 8 to 10 inches off the floor so wet mopping and floor contamination do not reach packages, 18 inches of clearance below sprinkler heads preserves fire suppression coverage, and roughly 2 inches from outside walls prevents condensation from wall surfaces reaching the packaging. The reversed and oversized figures in the other options do not match recognized practice and would either compromise fire protection or waste storage capacity without benefit.AAMI ST79

Why are corrugated cardboard shipping boxes prohibited in sterile storage areas?

• a.Cardboard absorbs the humidity needed to keep packaging pliable
• b.Cardboard blocks the airflow needed for positive pressure
• c.Cardboard sheds particulate, can harbor insects and moisture, and comes from uncontrolled outside environments✓
• d.Cardboard cannot be labeled with a lot control number

External shipping cartons travel through warehouses and loading docks, so they carry dust, pests, and moisture into a clean environment and they generate fiber particulate when handled. Supplies are removed from shipping containers in a separate breakout area before entering sterile storage. Airflow, humidity balance, and labeling are not the reasons behind the prohibition.AAMI ST79

A case cart of sterile packages must travel across the facility to an ambulatory procedure area. How should it be transported?

• a.Uncovered, so staff can verify the contents during transit
• b.Covered with a reusable cloth sheet that is laundered weekly
• c.In an open wire cart pushed quickly through public corridors
• d.In a closed or covered cart that protects packages from moisture, dust, and physical damage, handled to avoid crushing or compression✓

Sterile packages must be shielded from environmental contamination and mechanical damage during transport, and closed or covered carts accomplish both while keeping the load contained. Handling matters as much as covering, because compression, dropping, and dragging can breach a barrier without visible damage. Uncovered transport through corridors and infrequently laundered cloth covers do not provide reliable protection.AAMI ST79

A technician is restocking sterile storage with trays that were processed this morning. What inventory practice should be used?

• a.Last in, first out, so the newest and cleanest packages are used first
• b.Random selection, since event-related sterility makes rotation unnecessary
• c.First in, first out, placing newly processed packages behind existing stock so older packages are used first✓
• d.Rotate only implants and specialty trays; routine sets do not need rotation

First in, first out limits how long any package sits on the shelf, which reduces handling wear and the chance of an unnoticed barrier breach, and it keeps stock moving even under an event-related sterility policy. Event-related sterility means packages do not expire by date alone, but it does not eliminate the value of rotation and routine package inspection. Rotation applies to all sterile inventory, not only high-value items.AAMI ST79

A technician notices that a wrapped tray on the sterile storage shelf has a small tear in the outer wrapper. What should be done?

• a.Apply a patch of sterilization tape over the tear and return the tray to the shelf
• b.Remove the outer wrapper and use the tray, since the inner wrapper is intact
• c.Place the tray at the back of the shelf and use it only for non-sterile procedures
• d.Consider the package contaminated, return it to the department, and fully reprocess the contents including cleaning, inspection, repackaging, and sterilization✓

Any breach in packaging integrity is an event that ends sterility, so the package is removed from inventory and reprocessed from the beginning rather than salvaged. Taping a tear does not restore a sterile barrier and hides the defect from the next user. Assuming the inner wrapper stayed sterile is not defensible, and there is no lower-risk shelf on which a compromised sterile package may be kept.AAMI ST79

Which list correctly ranks microorganisms from most resistant to least resistant to sterilization and disinfection?

• a.Prions, bacterial spores, mycobacteria, nonenveloped viruses, fungi, vegetative bacteria, enveloped viruses✓
• b.Enveloped viruses, vegetative bacteria, fungi, bacterial spores, prions
• c.Vegetative bacteria, bacterial spores, prions, fungi, mycobacteria
• d.Fungi, prions, enveloped viruses, bacterial spores, mycobacteria

Prions are the most resistant agents known and require special extended reprocessing protocols, followed by bacterial spores, which is why spores are used as the challenge organism in biological indicators. Enveloped viruses such as hepatitis B and HIV are among the easiest organisms to inactivate because their lipid envelope is fragile. The other sequences reverse or scramble this hierarchy.CDC

During orientation, a technician is asked to define the term bioburden. Which answer is correct?

• a.The amount of chemical residue remaining on an instrument after rinsing
• b.The number of viable microorganisms present on an item before sterilization✓
• c.The total weight of an assembled instrument set
• d.The concentration of endotoxin in the final rinse water

Bioburden is the microbial population on a device prior to sterilization, and reducing it through thorough cleaning is what makes the sterilization process reliable. Higher starting bioburden means more organisms must be killed to reach the same sterility assurance level. Chemical residue, set weight, and endotoxin levels are separate quality parameters with their own controls.CDC

A surgical instrument that will enter sterile tissue is being reprocessed. According to the Spaulding classification, how must it be processed?

• a.Low-level disinfection is sufficient
• b.High-level disinfection is sufficient
• c.It is a critical device and must be sterilized✓
• d.Cleaning alone is sufficient if the device is single patient use

Critical devices such as surgical instruments, implants, and needles contact sterile tissue or the bloodstream and must be sterilized, because any surviving organism is introduced directly past the body's defenses. Semicritical devices that touch mucous membranes or nonintact skin require at least high-level disinfection. Noncritical devices that contact intact skin need only low-level disinfection, and cleaning is a prerequisite for all three levels.CDC

A technician wants to break the chain of infection during instrument reprocessing. Which action most directly interrupts the mode of transmission link?

• a.Receiving the hepatitis B vaccination series
• b.Reporting to occupational health after an exposure
• c.Keeping the decontamination area under negative pressure
• d.Performing hand hygiene and using containment during handling and transport of contaminated items✓

Mode of transmission is the link describing how an organism moves from a reservoir to a new host, so hand hygiene and containment of soiled items during handling and transport target that link directly. Vaccination protects the susceptible host link. Post-exposure reporting is a response measure rather than a chain interruption, and negative pressure primarily controls the environmental reservoir and airborne spread within the room.CDC

Under the OSHA Bloodborne Pathogens standard, what must the employer provide to an employee with occupational exposure risk?

• a.The hepatitis B vaccination series at no cost, offered within 10 working days of initial assignment, plus free personal protective equipment, training, and an exposure control plan✓
• b.Reimbursement for the hepatitis B vaccine after the employee pays for it
• c.The vaccine only after an employee sustains a documented exposure incident
• d.The vaccine only for employees who work directly in the operating room

The standard requires employers to offer the hepatitis B vaccination series free of charge and at a reasonable time and place within 10 working days of initial assignment to a job with occupational exposure, and to supply personal protective equipment, annual training, and a written exposure control plan at no cost. Employees may decline in writing and may accept later. The protection is not limited to a single department and is not contingent on a prior exposure incident.OSHA 29 CFR 1910.1030

A technician receives a tray from a patient with no known infection and no isolation precautions. What principle of standard precautions applies?

• a.Precautions are applied only when a patient is known to have a bloodborne infection
• b.All blood, body fluids, secretions, excretions except sweat, nonintact skin, and mucous membranes are treated as potentially infectious regardless of the patient's known status✓
• c.Precautions apply only to items arriving from isolation rooms
• d.Precautions apply only to sharp instruments

Standard precautions assume that infectious status is often unknown at the time of contact, so the same protective practices apply to every patient and every contaminated item. This is why all instruments arriving in decontamination are handled as if infectious, whatever the source. Restricting precautions to known infections, isolation cases, or sharps leaves the largest share of undiagnosed exposures unprotected.CDC

A new instrument detergent is delivered to the department. Where does the technician find the chemical's hazards, personal protective equipment requirements, and first aid measures?

• a.On the shipping invoice from the distributor
• b.In the device manufacturer instructions for use for the instruments
• c.On the Safety Data Sheet, which the employer must keep readily accessible to employees during every shift✓
• d.In the sterilizer operator manual

The OSHA Hazard Communication standard requires a Safety Data Sheet for every hazardous chemical in the workplace, with standardized sections covering hazards, handling, exposure controls, first aid, and spill response, kept accessible to workers at all times. Containers must also be labeled with the product identifier and hazard information. Invoices, device instructions, and equipment manuals do not carry this required chemical hazard information.OSHA 29 CFR 1910.1200

A technician opens a case cart and finds loose scalpel blades and suture needles mixed in with the instruments. What is the correct action?

• a.Pick the sharps out by hand while wearing double gloves and place them in a basin
• b.Run the entire tray through the washer first so the sharps are disinfected before handling
• c.Return the tray to the operating room without touching it and take no further steps
• d.Use forceps or another mechanical means to transfer the sharps directly into a puncture-resistant sharps container, then report the practice so the procedural area can correct it✓

Sharps are never handled directly, so a mechanical device such as forceps is used to move them into a labeled puncture-resistant container located as close as practical to the point of use. Reporting the finding is essential because the root cause is a point-of-use practice failure that will recur. Processing sharps through a washer does not make them safe to handle, and simply returning the tray leaves the hazard in place for the next person.OSHA 29 CFR 1910.1030

Which workstation adjustment best applies ergonomic principles in the decontamination area?

• a.Setting sink height so the working level is at or slightly below the technician's elbow, with anti-fatigue mats and adjustable work surfaces✓
• b.Setting all sinks to a single fixed height so every station is identical
• c.Encouraging technicians to lean over the sink to see instruments more clearly
• d.Requiring technicians to lift full instrument trays with the arms fully extended

Ergonomic design matches the workstation to the worker, and a sink whose working level sits at or just below elbow height keeps shoulders and wrists in neutral positions during long cleaning tasks. Anti-fatigue mats and height-adjustable surfaces accommodate staff of different statures. Fixed heights, sustained forward leaning, and lifting with extended arms all increase the risk of cumulative musculoskeletal injury.OSHA

A surgeon asks a sterile processing technician to release an instrument set that has not completed its sterilization cycle because the next case is waiting. What is the professional and correct response?

• a.Release the set, because the surgeon holds clinical authority over the department
• b.Release the set and document the surgeon's name as the person responsible
• c.Release the set only if a Class 1 process indicator is attached
• d.Decline to release the set, explain that the process is incomplete, offer alternatives such as another available set or a validated cycle, and escalate to the supervisor if the request continues✓

A technician's professional scope includes refusing to release items that have not completed a validated process, because patient safety outcomes depend on process integrity rather than schedule pressure. The correct approach is to communicate respectfully, offer workable alternatives, and escalate through the chain of command when necessary. Documenting another person's name does not transfer accountability, and an external process indicator provides no evidence that a cycle was completed.