HSPA Sterile Processing (CRCST) — 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.Perform a full manual wash at the sterile field before transport
• 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.Remove gross soil and keep the instruments moist until they reach decontamination✓

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 coagulates protein soil onto the instrument surface
• d.It raises the pH of the soak bath above the safe range for stainless steel

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

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

• a.A sterile gown and sterile gloves, because the instruments are contaminated
• 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.Gloves and a surgical mask only

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

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

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

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.Higher temperatures deactivate the chlorides that dissolve blood
• d.Heat above that point coagulates protein soil and bonds it to the instrument surface✓

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

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

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

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

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

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

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

• a.A rigid sterilization container with the filters removed for ventilation
• b.An open cart covered with a clean sheet and moved by the fastest route
• c.A closed or covered leak-proof container or cart labeled with a biohazard symbol or color coded✓
• 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.Rinse, disinfect, and lubricate
• b.Soak, sterilize, and dry
• c.Presoak, ultrasonic, and inspection
• d.Wash, intermediate rinse, and final rinse✓

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

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

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 acceptable if the technician removes gloves before drinking
• c.It is prohibited because eating, drinking, and storing food or drink are not allowed where occupational exposure occurs✓
• 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.Lower the final rinse temperature so minerals stay in solution
• c.Extend the wash phase by ten minutes on every cycle
• d.Address water quality with treatment such as softening or deionization, and use a descaling product as directed for existing deposits✓

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

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.Walk through quickly while holding the door with an elbow to avoid touching surfaces
• b.Keep the gown on but remove gloves, since the gown protects the clean area
• c.Remove all personal protective equipment in the decontamination area, dispose of or store it properly, and perform hand hygiene before entering✓
• 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.Wrap the set in a saline-dampened towel
• b.Apply an instrument pre-treatment foam, spray, or moisture-retaining product per the manufacturer instructions and keep the set covered✓
• c.Place the set in a warming cabinet so soil stays soft
• d.Immerse the entire set in a covered basin of tap water until pickup

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

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

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

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.Fungi, prions, enveloped viruses, bacterial spores, mycobacteria
• c.Enveloped viruses, vegetative bacteria, fungi, bacterial spores, prions
• d.Vegetative bacteria, bacterial spores, prions, fungi, 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 total weight of an assembled instrument set
• b.The number of viable microorganisms present on an item before sterilization✓
• c.The amount of chemical residue remaining on an instrument after rinsing
• 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.Cleaning alone is sufficient if the device is single patient use
• c.It is a critical device and must be sterilized✓
• d.High-level disinfection is sufficient

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.Keeping the decontamination area under negative pressure
• b.Reporting to occupational health after an exposure
• c.Receiving the hepatitis B vaccination series
• 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.The vaccine only for employees who work directly in the operating room
• c.The vaccine only after an employee sustains a documented exposure incident
• d.Reimbursement for the hepatitis B vaccine after the employee pays for it

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 apply only to items arriving from isolation rooms
• 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 sharp instruments
• d.Precautions are applied only when a patient is known to have a bloodborne infection

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 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.Return the tray to the operating room without touching it and take no further steps
• c.Run the entire tray through the washer first so the sharps are disinfected before handling
• 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

A splash guard is mounted at the decontamination sink, and staff are trained to brush instruments below the water line. How are these two measures classified?

• a.The splash guard is an engineering control and submerged brushing is a work practice control✓
• b.Both count as engineering controls because both are designed into the sink workstation itself
• c.The splash guard is personal protective equipment and submerged brushing is an engineering control
• d.Both count as work practice controls because both depend on how the technician performs a task

Engineering controls isolate or remove the hazard from the workplace: a splash guard, a sharps container, a needleless system. Work practice controls change the way the task is performed, and brushing beneath the water line is a change in technique, not a piece of hardware. Calling both engineering controls ignores that technique cannot be built into a fixture. Calling the guard personal protective equipment is wrong because PPE is worn on the body rather than fixed to the sink. Calling both work practice controls ignores the physical barrier the guard itself provides.OSHA 29 CFR 1910.1030

A technician's glove tears on a sharp instrument during decontamination and the skin underneath is punctured. What does the exposure control plan require?

• a.Wash the wound, report it to the supervisor at once, and get a confidential medical evaluation✓
• b.Finish the tray in process, then write the puncture in the incident log at the end of the shift
• c.Cover the site with a bandage and keep working, because a small puncture is not an exposure
• d.Request the patient chart from the operating room to decide whether source testing is needed

An exposure incident is a specific eye, mouth, mucous membrane, non-intact skin, or parenteral contact with blood or other potentially infectious material. The standard requires immediate washing, immediate reporting, and a confidential post-exposure medical evaluation at no cost, because prophylaxis is time sensitive. Waiting until the end of the shift to log the injury destroys that window. Bandaging and continuing treats a percutaneous injury from a contaminated instrument as trivial when it is by definition an exposure. Pulling the patient chart is not the technician's role; source testing is arranged through the employer's post-exposure process.OSHA 29 CFR 1910.1030

Which item generated in the decontamination area meets the OSHA definition of regulated waste?

• a.A wrapper pulled off a clean instrument tray at the assembly bench earlier in the shift
• b.A paper towel with a dried spot of blood that stays fixed to the towel when it is handled
• c.A blood-soaked sponge that would release liquid blood if it were compressed in the hand✓
• d.An empty rigid container that held the irrigation saline poured during the procedure

Regulated waste is liquid or semi-liquid blood or other potentially infectious material, items caked with or soaked in it that would release it when compressed, contaminated sharps, and pathological and microbiological wastes. A saturated sponge that would express blood meets that release test. A dried spot that stays fixed to a towel does not release anything and goes in ordinary trash. Packaging pulled off a clean tray in assembly was never contaminated. An empty saline container held sterile irrigation fluid, not blood, so it is not regulated waste either.OSHA 29 CFR 1910.1030

How must contaminated surgical linens be handled when they are stripped from a soiled case cart?

• a.Bagged or containerized where they are used and handled as little as possible, with labeling✓
• b.Rinsed under running water at the decontamination sink to remove gross blood before pickup
• c.Shaken out and sorted by linen type at the soiled receiving counter before they are bagged
• d.Loaded into an uncovered clear hamper so the laundry crew can verify contents on arrival

Contaminated laundry must be handled as little as possible, with a minimum of agitation, and must be bagged or containerized at the location where it was used; the bag is labeled or color coded, and a leak-resistant bag is used if soak-through is likely. Shaking and sorting at the counter aerosolizes contamination and is specifically prohibited. Rinsing at the decontamination sink creates splash and puts blood into the instrument sink. An uncovered hamper gives no containment and defeats the labeling requirement, which exists so downstream workers know what they are receiving.OSHA 29 CFR 1910.1030

A suction lumen is left unrinsed on a soiled cart across a long weekend. Why is biofilm the central concern?

• a.Blood dries into a hard crust that dissolves the moment an enzymatic detergent contacts it
• b.Microbes attach to the wet lumen wall and build a sticky polysaccharide matrix within hours✓
• c.Mineral scale from utility water precipitates and coats the channel with a chalky deposit
• d.Airborne fungal spores settle in the dry channel and germinate only after steam exposure

Biofilm begins when free-floating organisms attach to a moist surface and secrete an extracellular polymeric matrix; in a wet, soiled lumen this can begin within hours and mature over days. Dried blood is a real problem, but it does not simply dissolve on contact with enzymatic detergent; it needs prolonged soaking and mechanical action. Mineral scale comes from the water supply and appears after repeated processing, not from a soiled instrument sitting on a cart. Fungal spores settling in a channel are not the mechanism here, and steam exposure inactivates rather than germinates them.AAMI ST79

Why does an established biofilm resist both detergents and high-level disinfectants?

• a.Biofilm organisms are all spore formers, so only an extended steam cycle can penetrate them
• b.The matrix shields the embedded cells from the chemical, so the deposit must be removed by force✓
• c.The matrix is strongly alkaline and neutralizes any detergent with a pH below eight on contact
• d.Biofilm grows only on plastic surfaces, and a chemical solution cannot wet hydrophobic plastic

The extracellular matrix acts as a physical and chemical barrier that limits penetration and lets embedded cells survive contact times that would kill the same organisms free-floating; mechanical action such as brushing, flushing, and fluid impingement is what actually strips the deposit. Biofilm communities are mostly vegetative organisms, not spore formers, so the spore explanation misstates the biology. The matrix does not work by neutralizing detergent pH. Biofilm forms readily on stainless steel and on lumen walls, not only on plastics, which is why prompt point-of-use treatment is the real defense.AAMI ST79

A technician handles a soiled tray, then carries a clean wrapped set with the same gloves. Which link in the chain of infection has the technician supplied?

• a.The susceptible host, because the next patient is the person who receives the device
• b.The mode of transmission, because contaminated gloves carry organisms to a clean item✓
• c.The portal of exit, because the organisms are leaving the soiled tray on the glove surface
• d.The reservoir, because the glove is the place where the organisms live and multiply freely

The chain runs infectious agent, reservoir, portal of exit, mode of transmission, portal of entry, susceptible host. Gloves moving from soiled to clean are the vehicle carrying organisms from one place to another, which is the transmission link, and it is the link technicians break with glove changes, hand hygiene, and one-way workflow. The susceptible host is the patient, not an action the technician performs. The portal of exit is where organisms leave the reservoir, which happened at the surgical site, not on the glove. The reservoir is the soiled tray, since a glove surface is not a place organisms live and multiply.CDC

Instruments are used on a patient with suspected Creutzfeldt-Jakob disease. Why is a routine steam cycle inadequate, and what is done instead?

• a.Prions are heat stable below boiling, so a dry heat cycle at 320 degrees F is substituted
• b.Prions resist routine parameters, so the set is kept moist and given extended special cycles✓
• c.Prions cause no infection from instruments, so routine cleaning and a standard cycle suffice
• d.Prions survive detergent, so the set is soaked in bleach for eight hours and then stored dry

Prions are the most resistant infectious agents known and are not reliably inactivated by standard steam parameters, so recognized protocols keep the instruments wet so protein never dries, avoid processes that fix protein, and use an extended treatment such as prolonged steam exposure with or without an alkaline chemical step, with single-use items preferred. Dry heat is less effective than moist heat here and would bake protein onto the surface. An overnight bleach soak alone is not the recognized protocol and would severely corrode the instruments. Treating prion cases as routine ignores documented iatrogenic transmission through surgical instruments.AAMI ST79

A storage rack has been rolled in front of the decontamination eyewash station. Why does this matter?

• a.Eyewash units must be tested under load monthly, and the rack blocks the drain during testing
• b.The rack keeps the water from staying tepid, and cold flushing fluid injures the eye further
• c.Blocking the unit voids the manufacturer warranty on the valve and the flushing fluid nozzles
• d.The station must be reachable in about ten seconds along an unobstructed path from the hazard✓

An emergency eyewash or drench shower must be located so an injured worker can reach it within roughly ten seconds of travel on a path free of obstructions, because a splash victim may not be able to see. Plumbed units are activated weekly to flush the supply line and are inspected annually, so a monthly load test is not the requirement, and a rack is not a drainage problem. Warranty language is not the safety issue and is not what a surveyor cites. Flushing fluid should be tepid, but a rack sitting in the aisle has no effect on the water temperature; the hazard is purely the blocked access.ANSI Z358.1

A technician sees a puddle of detergent solution spreading across the decontamination floor from a leaking sink. What is the correct response?

• a.Step around the puddle and finish the tray, then report the leak at the shift handoff meeting
• b.Ask the supervisor to decide whether housekeeping or maintenance should respond to the spill
• c.Throw absorbent towels over the puddle and leave them there so the liquid soaks up on its own
• d.Mark the area, clean up the liquid promptly, and place a wet floor sign until it is fully dry✓

Walking and working surfaces must be kept clean, dry, and free of hazards, and a technician who sees a spill is expected to contain and clean it immediately rather than route the decision to someone else. Stepping around it and mentioning it hours later leaves a slip hazard for every person entering the room. Asking who should respond is a way of postponing a duty the technician can discharge in a minute, and a fall can happen while the question is being answered. Towels left in place become a saturated, slick trip hazard themselves and do not dry the floor.OSHA 29 CFR 1910.22

Which cleaning tool is appropriate for scrubbing the serrations and box lock of a hemostat?

• a.A stainless steel wool pad, which reaches into serrations better than any other tool made
• b.A cellulose sponge, because it holds detergent solution against the surface while scrubbing
• c.A cotton huck towel folded over the jaws, so the weave works soil out of the serration teeth
• d.A soft nylon bristle brush sized to the instrument, worked below the surface of the solution✓

A soft bristle brush delivers mechanical action into serrations and box locks without scratching, and it is used under the solution surface to avoid aerosols. Steel wool and other abrasives scratch the surface and strip the passive chromium oxide layer, which invites pitting and corrosion. A sponge cannot reach into a serration and its cells can harbor organisms, which is why sponges are discouraged for instrument cleaning. A towel wipes exteriors but has no way to reach the depth of the teeth or the interior of the box lock joint.AAMI ST79

A technician removes a stubborn stain from a retractor with an abrasive scouring pad. What is the consequence for the instrument?

• a.The abrasive has no lasting effect because the passive layer reforms during the next steam cycle
• b.The abrasive raises the surface hardness of the steel and makes future soil harder to remove
• c.The abrasive removes the manufacturer etching only, which is a marking rather than a real defect
• d.The abrasive strips the passive chromium oxide layer and leaves the steel prone to corrosion✓

Surgical stainless steel is protected by a thin passive chromium oxide film; scratching it with an abrasive exposes bare metal that pits, stains, and corrodes, and the scratches themselves hold soil. Abrading does not harden the steel surface, and the practical result is a rougher surface that is harder to clean, not a stronger one. Loss of etched identification is a minor side effect compared with the loss of corrosion resistance. Passivation can be restored, but it is a controlled process done by a repair vendor, not something a steam cycle accomplishes on a scratched instrument.AAMI ST79

How are reusable lumen brushes themselves handled at the end of the day in decontamination?

• a.Rinsed under hot running water, shaken dry, and hung on the rack above the sink for reuse
• b.Cleaned and then disinfected or sterilized at least daily, and replaced when bristles wear✓
• c.Soaked overnight in the enzymatic detergent from the wash sink so soil loosens before reuse
• d.Wiped with a disinfectant towelette at the end of each use and returned to the drawer to dry

A reusable brush is itself a contaminated item: it must be cleaned and then high-level disinfected or sterilized at least daily, and it is discarded once the bristles are splayed, worn, or missing, because a worn brush no longer delivers mechanical action. A rinse and shake leaves soil and organisms in the bristle bed. Soaking overnight in used detergent turns the container into a growth reservoir and recontaminates the brush. A surface wipe cannot reach the interior of the bristle bundle, which is exactly where the soil collects, and single-use brushes are simply discarded after one use.AAMI ST79

What is a cart washer designed to process?

• a.Ophthalmic instrument sets, because its long rinse gives the most complete residue removal
• b.Rigid containers only, since the chamber spray pattern is validated for container lids alone
• c.Case carts, transport carts, and other large items that fit the chamber and tolerate the cycle✓
• d.Flexible endoscopes, because the chamber can hold a coiled scope without kinking the insertion tube

A cart washer is a large chamber that cleans and often thermally disinfects case carts, transport carts, basins, and other bulky items that fit the rack and tolerate the temperatures and chemistry of the cycle. Ophthalmic sets need gentle handling and thorough critical water rinsing under their own instructions, not a bulk cart cycle. Rigid containers may be processed in many cart washers, but limiting the unit to container lids misdescribes what the equipment is for. Flexible endoscopes are never processed in a cart washer; they require leak testing, manual cleaning, and an automated endoscope reprocessor or manual high-level disinfection.AAMI ST79

At what point in reprocessing a flexible endoscope is the leak test performed?

• a.After bedside precleaning and before the scope is immersed in the cleaning solution✓
• b.After manual cleaning has finished and just before the scope enters the reprocessor
• c.After high-level disinfection, so a fresh perforation is caught before the scope is stored
• d.Only when a technician can see visible damage on the insertion tube or the bending section

Leak testing comes early, before immersion, so that fluid never enters a breach in the sheath or channel; a scope that fails is removed from service and sent for repair without being soaked. Testing after manual cleaning is too late, because the scope has already been submerged and internal components may already be wet. Testing after high-level disinfection is later still and would let a damaged scope be processed with an inaccessible internal contamination. Testing only when damage is visible misses the pinholes and channel breaches the test exists to find, which are rarely visible.AAMI ST91

The detergent container that feeds a washer-disinfector runs empty midway through the shift. What should the technician do?

• a.Top it off with whatever compatible detergent is open in the room to avoid a cycle interruption
• b.Refill with the detergent named in the equipment instructions and confirm the pickup tube seats✓
• c.Fill it with the ultrasonic detergent, since both products are cleaning agents for instruments
• d.Ask the supervisor which product belongs in the container before any further loads are run

The chemical is part of the validated cycle: the technician replaces it with the product the equipment instructions specify, verifies the pickup tube is fully seated in the correct container, and checks that the dosage indication returns to normal. Substituting whichever product is open risks foaming, incompatible chemistry, and damage. Routing a routine, documented task to someone else stalls production when the instructions on the machine already name the product. Ultrasonic detergent is formulated for a different process and can foam heavily in a spray washer, which suppresses impingement and ruins cleaning.Device IFU

A detergent label calls for one ounce per gallon, and a technician doubles the dose to clean a heavily soiled set faster. Is that practice acceptable, and why?

• a.Acceptable, because instrument detergent is nontoxic and any excess is carried off in the rinse phase
• b.Acceptable, because dilution ratios on the label are minimums intended for light soil only
• c.Wrong, because concentration is a validated parameter and excess leaves residue and may harm items✓
• d.Wrong, because doubling detergent lowers the wash temperature below the validated set point

Dilution is validated by the chemical manufacturer along with temperature and contact time; over-concentration wastes product, leaves residue that can stain instruments or irritate skin, can foam enough to defeat impingement, and can damage aluminum and other sensitive materials. Calling excess harmless assumes rinsing removes everything, which is exactly the assumption behind residue-related patient reactions. Reading the ratio as a minimum for light soil inverts the label, which states a working concentration, not a floor. Detergent concentration does not lower the wash temperature; the heater controls that independently.Device IFU

A technician finds an unlabeled spray bottle of clear liquid on the decontamination counter with no expiration or contents marking. What is the correct action?

• a.Smell the contents carefully to identify the chemical, then write a label and continue using it
• b.Do not use it, and report the unlabeled container to the supervisor so it can be identified✓
• c.Use it only for wiping down counters, since surface cleaning is the lowest risk application
• d.Pour it down the drain with running water and refill the same bottle with fresh detergent

A secondary container of unknown contents cannot be identified by the user, so hazards, personal protective equipment, and first aid are unknown and no safety data sheet can be matched to it. The chemical is not used, and the finding is reported so it can be identified or disposed of correctly. Sniffing an unknown chemical is an exposure route and is exactly what hazard communication training forbids. Restricting it to counters still exposes the worker and the surfaces. Pouring an unknown chemical down the drain may violate disposal rules and can react with what is already in the plumbing.OSHA 29 CFR 1910.1200

What does a cleaning verification test placed in a washer-disinfector rack actually challenge?

• a.The drying phase, because residual moisture on the coupon is what the reading is based upon
• b.The thermal rinse only, because the indicator soil is formulated to release above 180 degrees
• c.The wash phase itself, since a soil-coated coupon tests impingement, chemistry, time, and heat✓
• d.The water quality only, since the coupon reacts to hardness minerals rather than to soil removal

A cleaning verification device carries a standardized test soil into the load, and its removal depends on the whole wash phase working together: mechanical impingement from the spray arms, correct detergent dosing, adequate temperature, and adequate time. Reading it as a thermal rinse check confuses cleaning verification with the disinfection temperature record on the printout. It is not a dry-time test; residual moisture is judged by inspecting the load. And it is not a water hardness test; scale and film are evaluated separately through water quality monitoring and visual inspection.AAMI ST79

A technician runs an aluminum foil test in the ultrasonic cleaner. What result indicates the unit is working correctly?

• a.The foil stays smooth and intact, showing the sound waves passed through without damaging it
• b.The foil is perforated heavily at one corner only, showing the transducers focus energy there
• c.The foil shows small pits and wrinkles spread evenly across every strip in the tank✓
• d.The foil dissolves completely, showing that cavitation energy reached its maximum output

Cavitation erodes foil, so a working tank leaves uniform pitting and wrinkling on strips hung at several points, which shows energy is distributed through the whole bath. Smooth intact foil means cavitation is weak or absent, often from failed transducers or a tank that was not degassed. Heavy damage in a single zone with clean areas elsewhere signals dead spots, and instruments placed in those zones will not be cleaned. Foil does not dissolve in an ultrasonic bath; that description is not a possible outcome of the test and would indicate a chemical reaction rather than cavitation.AAMI ST79

The department runs both a foil test and a commercial soil-based test in the ultrasonic. Why are both used?

• a.The foil test checks water quality, and the soil test checks the temperature of the bath
• b.The foil test maps cavitation energy, and the soil test shows soil is actually being removed✓
• c.The foil test is for empty tanks, and the soil test is required whenever a tank is loaded
• d.The foil test is a daily legal requirement, and the soil test is an optional annual audit

The two tests answer different questions: foil demonstrates that cavitation energy is present and evenly distributed in the tank, while a commercial cleaning verification device carries a standardized soil and shows the process actually removes it under real conditions. Neither test measures water hardness or bath temperature, which are monitored separately. Neither is defined by whether the tank happens to be loaded. And neither is a legal requirement with an annual audit schedule; both are quality tests performed at the frequency set by the equipment instructions and department policy, commonly each day of use.AAMI ST79

Which quality practice belongs to an automated endoscope reprocessor program?

• a.Channel cleaning verification testing plus solution concentration and cycle record review✓
• b.A biological indicator with resistant spores is placed in a scope channel for every cycle
• c.Foil strips are suspended in the basin to confirm cavitation before the scopes are loaded
• d.A Bowie-Dick style air removal sheet is run in the chamber at the start of each working day

Endoscope programs verify that manual cleaning worked by testing channels for residual organic markers such as protein or adenosine triphosphate, and they verify the reprocessor by checking the disinfectant concentration, keeping the printed or electronic cycle record, and following the manufacturer's self-disinfection and filter maintenance schedule. A Bowie-Dick sheet tests air removal in a dynamic-air-removal steam sterilizer and has no meaning in a reprocessor. Routine biological indicators belong to sterilization monitoring, not to high-level disinfection cycles. Foil strips test an ultrasonic tank, not a reprocessor basin.AAMI ST91

How is the cleaning performance of a cart washer verified?

• a.The chamber temperature printout is filed, which is accepted in place of any cleaning test
• b.The operator wipes a finished cart with a white towel and records that no soil is visible
• c.A cart washer test device is fixed on a cart and read after the cycle at the set frequency✓
• d.A biological indicator strip is taped to the cart shelf and incubated after the cycle ends

Cart washers are verified with a commercially available cart washer cleaning test device mounted on the cart in a challenging location, run at the frequency stated by the equipment and test manufacturers, with the result documented. A white towel wipe is a useful visual check but is not a validated challenge and misses interior and underside surfaces. The temperature printout is a physical monitor of the cycle and says nothing about whether soil was removed. Biological indicators monitor sterilization, and a cart washer neither claims nor achieves sterilization.AAMI ST79

The daily cleaning verification test in a washer-disinfector fails, and a repeat test with a new device also fails. What is the correct response?

• a.Run the failed loads a second time in the same washer and release them if the trays look clean
• b.Keep the washer running and mark the failed device as inconclusive until service arrives
• c.Take the washer out of service, notify the supervisor, and hold items back to the last pass✓
• d.Switch to a longer cycle on the same washer and continue processing while service is arranged

Two consecutive failures mean the machine cannot be trusted, so it is removed from service, the failure is reported so repair and investigation can begin, and every item processed since the last passing test is identified and reprocessed once a working method is available. Rerunning loads in the same suspect washer repeats an unverified process and visual inspection alone cannot confirm cleaning. Labeling a documented failure as inconclusive is a records problem and leaves patients exposed. A longer cycle on the same machine does not fix a mechanical or chemical fault that the test just identified twice.AAMI ST79

What belongs in the record for a mechanical cleaning efficacy test?

• a.Date, machine and cycle identification, test lot, result, operator, and any action taken✓
• b.The purchase order number for the test devices and the vendor contact who supplied them
• c.The surgeon and procedure the next set is intended for, so a failure can be traced to a case
• d.The room temperature and humidity at the time of the test, plus the water hardness reading

An efficacy record has to let someone later reconstruct which machine was tested, when, with what test lot, by whom, what the result was, and what was done about a failure; those fields are what make a recall or a survey defensible. Surgeon and procedure belong to case records, not to equipment testing. Purchase order data is a purchasing record and does nothing for traceability of the test. Environmental readings are logged separately as part of environmental monitoring and do not identify the machine or the outcome of the test.AAMI ST79

Why are washer-disinfector chamber strainers and drain screens checked and cleaned at the frequency in the operator manual?

• a.Because a clogged strainer causes the door gasket to leak and floods the equipment room floor
• b.Because the strainer collects detergent solids that must be recovered and returned to the tank
• c.Because a clean strainer shortens the cycle time and increases the number of loads per shift
• d.Because debris restricts drainage and recirculation, which cuts spray pressure and cleaning✓

Debris caught in the strainer restricts water flow through the pump and spray system, so pressure at the arms falls and soil is redistributed rather than washed away; that is why cleaning the strainer is a daily operator task in most manuals. A blocked strainer does not cause a gasket to leak; door leaks come from gasket damage or misalignment. Solids trapped by the strainer are waste and are discarded, never returned to the wash tank. And cycle length is controlled by the programmed parameters, not by how clean the strainer happens to be.Device IFU

During the daily equipment check a technician finds a washer spray arm that turns stiffly and has two jets plugged with debris. What is the correct action?

• a.Report the finding to the supervisor and run the scheduled loads while the repair is arranged
• b.Clear the plugged jets and free the arm as the operator manual directs, then verify free rotation✓
• c.Load lighter trays on that level so the reduced spray pressure still reaches every instrument
• d.Record the finding on the daily log and recheck the arm at the end of the shift to see if it improves

Checking spray arms for free rotation and clear jets is a defined operator task, and the manual tells the technician how to clear them, so this is corrected on the spot and rotation is verified before the next load. Reporting it and running loads anyway knowingly processes trays through a machine that cannot deliver full impingement. Loading lighter trays does not restore the water pattern from blocked jets, and the shadowed items still come out soiled. Deferring the recheck to the end of the shift means an entire shift of loads passes through equipment already known to be impaired.AAMI ST79

A robotic instrument with a long channel is placed in a washer basket without being attached to a manifold port. Which statement about that load is correct?

• a.The channel will not be cleaned, because lumens need flow driven through them by the connector✓
• b.This is acceptable if the basket sits on the top level, where spray pressure is highest overall
• c.This is acceptable because the detergent solution wicks through any lumen by capillary action
• d.The channel will be cleaned only if the ultrasonic cycle is selected instead of the standard one

External spray cannot force water through a long narrow channel; the manifold and its lumen connectors exist to direct flow through the interior, and an unattached lumened device leaves the channel unprocessed. Shelf position changes nothing, because the interior of a lumen is shadowed no matter where the basket sits. Capillary wicking moves a small amount of liquid but produces none of the flow and mechanical action cleaning requires. Selecting a different cycle does not create flow through a channel that is not connected to a port, and lumen instructions normally require both brushing and flushing.Device IFU

Why are washer racks and baskets themselves inspected and cleaned on a schedule?

• a.Because soil, scale, and bent wires on a rack block spray and can hold instruments incorrectly✓
• b.Because clean racks let the department extend the interval between the chamber strainer cleanings
• c.Because racks are counted as patient care items and carry their own sterilization records
• d.Because rack weight affects the detergent dose the machine injects at the start of the wash

A rack is a working part of the process: built-up soil and scale contaminate the load, and bent or broken wires let instruments shift, nest, and shadow one another from the spray, so racks are inspected and cleaned per the manual and repaired when damaged. Racks are not patient care items and do not carry sterilization records of their own. Rack condition has no bearing on how often the chamber strainer needs cleaning; both are separate scheduled tasks. Detergent is dosed by the programmed cycle and water volume, not by how heavy the rack is.AAMI ST79

A washer-disinfector stops mid-cycle and displays an alarm code, and the load is still inside the chamber. What is the correct action?

• a.Open the door, move the wet trays to another washer, and start that machine on its shortest cycle
• b.Treat the load as unprocessed, tag the washer out of service, and report the code to the supervisor✓
• c.Leave the load in place until the next shift so the alarm can be shown to the arriving staff
• d.Reset the alarm and restart the same cycle repeatedly until the machine completes it normally

An interrupted cycle means the validated process was not completed, so the load is handled as still contaminated and reprocessed from the start in working equipment, while the machine is tagged out of service and the code reported to the supervisor so the fault can be diagnosed. Moving the trays and running a short cycle skips the full wash the items never received. Repeatedly resetting and restarting hides a fault and can damage the equipment further. Leaving a contaminated wet load sitting for a shift lets soil dry and biofilm develop, and it takes the washer out of production anyway.AAMI ST79

Several outlets in the decontamination area have red faceplates. What does that indicate to the technician?

• a.They are ground fault protected and are the only outlets approved for use near a wet sink
• b.They are rated for higher amperage and are reserved for the largest motors in the department
• c.They are on the emergency power branch and keep working when normal utility power is lost✓
• d.They are switched from a master control and are shut off automatically at the end of a shift

Red receptacles mark circuits fed by the essential electrical system, so equipment that must survive an outage is plugged into them; technicians should know which outlets those are before a power failure occurs. Color coding is not an amperage rating, which is indicated by the receptacle configuration itself. Ground fault protection near water is provided by ground fault interrupter devices, which are identified by their test and reset buttons rather than by faceplate color. And red outlets are not tied to a shift timer; they stay energized precisely because they are backed by the generator.NFPA 99

Instruments leave the washer with a light film, and the technician suspects the detergent is not being delivered. What is the correct first step?

• a.Check the chemical feed line for kinks and air, confirm dosage on the printout, and verify supply✓
• b.Pour detergent directly into the chamber before each load until a service visit takes place
• c.Increase the wash temperature by twenty degrees to compensate for the reduced chemical action
• d.Run every load twice, since two wash phases deliver roughly the same total amount of chemical action

Detergent delivery is verified by tracing the feed line for kinks, cracks, and air, confirming the container is not empty and the pickup is seated, and reading the dosage the machine records for the cycle; that identifies whether the fault is supply, line, or pump. Pouring chemical into the chamber bypasses the metering system and gives an unknown concentration. Raising temperature does not replace chemistry and can bake protein onto instruments. Running loads twice doubles turnaround while still delivering whatever wrong dose caused the problem in the first place.Device IFU

A laparoscopic instrument set arrives with disposable tips still attached to the reusable shafts. What is the correct action?

• a.Reprocess the tips with the shafts, since anything that entered the body is cleaned the same way
• b.Discard the entire instrument, because a device with a disposable component is single use overall
• c.Ask the supervisor whether the disposable tips may be reprocessed along with the shafts
• d.Remove and discard the single-use tips, then clean and reprocess the reusable shafts per the IFU✓

Sorting reusable from disposable is a decontamination task: single-use tips are removed and discarded, and the reusable shafts are disassembled, cleaned, and reprocessed under the manufacturer instructions. Reprocessing a single-use component treats a device with no validated reprocessing instructions as if it had them. Discarding the reusable shaft over an attached disposable tip throws away expensive instrumentation for no reason. Asking permission to combine the two delays a routine task that the device labeling already settles, because a component marked single use is discarded on sight.FDA

A hospital contracts with a third-party company to reprocess certain single-use devices as part of its sustainability program. Which statement about that arrangement is correct?

• a.The practice is prohibited outright in the United States and the contract itself violates federal rules
• b.The company may relabel devices as reusable without any submission because it is not the maker
• c.The devices may be reprocessed an unlimited number of times as long as they still look intact
• d.The reprocessor is regulated as a manufacturer and must meet clearance and labeling requirements✓

A third-party reprocessor of single-use devices is held to manufacturer obligations: it must obtain clearance for the device it reprocesses, validate the process, label the item, and track the number of permitted cycles, which is what makes the practice lawful and auditable. The practice is not prohibited; it is regulated. A reprocessor cannot simply declare a device reusable outside that framework. And use is limited to a validated number of cycles, so visual appearance is never the deciding factor for how many times a device may be reprocessed.FDA

Which item from an opened case cart goes into the regular waste stream rather than into a biohazard or sharps container?

• a.A saturated laparotomy sponge that drips fluid when it is lifted out of the basin with forceps
• b.A suture needle that was left loose among the instruments in the bottom of the tray pan
• c.A suction canister of body fluid that has not been solidified or emptied for disposal yet
• d.A dry paper count sheet that was clipped to the outside of the tray and is free of soil✓

Uncontaminated paper such as a clean count sheet is ordinary trash, and sending it to regulated waste needlessly raises disposal cost and volume. A suture needle is a contaminated sharp and must go directly into a puncture-resistant sharps container, handled with forceps rather than fingers. A canister of liquid body fluid is regulated waste and is handled per the facility's fluid disposal method. A dripping sponge releases liquid and meets the release test for regulated waste, so it belongs in a biohazard container, not in the trash.OSHA 29 CFR 1910.1030

A loaner tray for tomorrow morning's first case is delivered to the dock at 6:30 that same morning. What is the problem?

• a.Loaners must arrive early enough to be inventoried, cleaned, inspected, and fully reprocessed✓
• b.Loaner trays may be used directly from the vendor case if they arrive on the day of surgery
• c.Loaners require a two-day quarantine in sterile storage before they may be issued to a case
• d.Loaners must be delivered directly to the operating room rather than through the loading dock

Loaned instrumentation must reach the department with enough lead time to be inventoried against the vendor list, decontaminated, inspected, assembled, sterilized, and cooled, which is why facilities set an arrival deadline in advance of the case. Using a vendor tray straight from the case skips decontamination and sterilization entirely. There is no two-day quarantine requirement for loaners; the constraint is processing time, not shelf time. Routing loaners directly to the operating room bypasses the department that is responsible for reprocessing them.AAMI ST79

A loaner tray arrives sealed and marked sterile by the vendor, but no manufacturer instructions accompany it. What is the correct action?

• a.Place it directly into sterile storage, because the vendor seal shows it was already processed
• b.Hold the tray and notify the supervisor so the vendor instructions can be obtained before use✓
• c.Run it through the department's standard wrapped prevacuum cycle used for general instruments
• d.Assemble and sterilize it using the instructions from a similar tray owned by the department

A loaner set must be reprocessed by the receiving facility according to the device manufacturer's written instructions, and without those instructions the correct cycle, disassembly, and any special cleaning steps are unknown, so processing is held while the instructions are obtained. Accepting a vendor sterile claim and storing the tray skips the facility's own validated process. Defaulting to a house cycle assumes parameters that may not match the device, which is a common cause of wet or unsterile implant sets. Borrowing instructions from a similar-looking tray applies parameters validated for a different device.AAMI ST79

How should a basket of soiled instruments be prepared before it goes into a washer-disinfector?

• a.Instruments closed and stacked tightly so that more of the set fits into a single wash basket
• b.Heavy retractors placed on top of delicate items to hold the light instruments down in the spray
• c.Multi-part instruments left assembled so that no small components are lost during the cycle
• d.Instruments disassembled, hinges opened, sorted by type, and arranged in a single layer✓

Preparation for mechanical cleaning means taking apart every device the instructions say can be taken apart, opening box locks and ratchets so mating surfaces are exposed, separating sharp and delicate items from heavy ones, and laying instruments so water reaches all surfaces rather than piling them. Closed and tightly stacked instruments shield the very surfaces that hold soil. Putting heavy retractors on top of delicate items crushes them and shadows them from the spray. Leaving multi-part devices assembled traps soil in the joints; small parts are protected in a mesh container instead.AAMI ST79

A technician is about to use a high-pressure water gun to flush a cannulated instrument at the sink. How should the gun be used?

• a.Use it only after the gown is removed, because a wet gown loses its fluid resistance quickly
• b.Use it held above the sink rim so the technician can watch the debris leave the instrument
• c.Use it with a full face shield, with the tip inside the sink and directed away from the body✓
• d.Use it at the lowest available pressure so that no aerosol is created during the flushing step

Pressurized water and air guns create aerosols and splash, so they are used inside the sink or an enclosure with the stream directed away from the user, and full face and eye protection plus a fluid-resistant gown are worn. Holding the gun above the sink rim to watch debris sprays contaminated fluid into the room and at the face. Removing the gown removes protection at the exact moment the highest splash risk occurs. Dropping to the lowest pressure does not eliminate aerosol and may fail to clear the channel, so the instructions for the device set the pressure.AAMI ST79

After manual cleaning, a technician sees dried soil remaining in the serrations of two instruments in the tray. What is the correct action?

• a.Send the tray forward and mark the two instruments for closer inspection at the assembly bench
• b.Place the two instruments back in the ultrasonic and send the rest of the tray forward without them
• c.Ask the supervisor whether the tray may move forward, since only two instruments are affected
• d.Return both instruments to the wash sink for repeat cleaning, then inspect them again under light✓

Visual inspection is a step in the manual cleaning process, and an item that is not visibly clean is simply cleaned again and re-inspected, ideally with magnification and good lighting. Passing soiled instruments forward for someone else to catch moves contamination into the clean side. Asking permission to advance a visibly soiled item requests an exception to a rule that has no exception, and it delays work the technician can do immediately. Sending part of a set forward while two members are still in process breaks the set apart and creates count and tracking problems at assembly.AAMI ST79

What distinguishes utility water from critical water in the decontamination area?

• a.Utility water is heated above 180 degrees, while critical water is used at room temperature only
• b.Utility water is tap water used for flushing and washing; critical water is extensively treated✓
• c.Utility water is treated with a disinfectant, while critical water is filtered but left untreated
• d.Utility water is used for the final rinse, while critical water is reserved for the initial soak

Utility water is the ordinary supply used for flushing, washing, and intermediate rinsing, while critical water has been extensively treated by methods such as deionization or reverse osmosis with filtration to remove minerals, ions, and microbial contaminants, and it is used for the final rinse and for steam generation. Temperature does not define either category. Neither category is defined by adding a disinfectant to the supply. And the roles in the last statement are reversed, since the final rinse is exactly where critical water matters most.AAMI TIR34

How is the correct brush chosen for cleaning the channel of a cannulated instrument?

• a.The smallest available brush is used, since a narrow brush slides through without any resistance
• b.A brush with metal bristles is used, because plastic bristles bend before they dislodge dried soil
• c.The bristle diameter matches the lumen and the brush is long enough to exit the far end✓
• d.Any brush is acceptable as long as it is passed through the channel three times in each direction

A brush cleans only if its bristles contact the channel wall, so diameter is matched to the lumen and length is sufficient for the brush to pass fully through and be cleaned before it is drawn back, all per the device instructions. An undersized brush slides through touching nothing and gives false confidence. Metal bristles scratch the channel and destroy the passive layer, so soft bristles of the correct size are used. Counting passes is meaningless if the brush is the wrong size, and brushes are inspected for worn bristles and replaced when they no longer clean.AAMI ST79

A technician loads a washer-disinfector rack with basins, cups, and several trays for one cycle. Which loading practice is correct?

• a.Cups are set upright so that detergent solution collects inside them throughout the wash phase
• b.Basins are filled with water before the cycle starts so the detergent has more volume to work within
• c.Trays are stacked flat on top of one another so the maximum number of sets fits in the chamber
• d.Concave items are tilted or inverted, trays are spaced, and the rack is not loaded above capacity✓

Load configuration decides whether water reaches surfaces: concave items are positioned so solution drains rather than pools, items are spaced so they do not shadow one another, and the manufacturer's load capacity is respected. Prefilling basins with water adds weight and displaces spray without improving chemistry. Stacking trays flat blocks the spray from everything underneath and is a common cause of soiled instruments and wet loads. Cups placed upright hold dirty solution through the cycle and carry it into the rinse, which leaves residue behind.AAMI ST79

Ophthalmology reports a cluster of postoperative anterior segment inflammation after cataract cases. Which reprocessing factor is a recognized cause of toxic anterior segment syndrome?

• a.Sterilizing the cannulas at 270 degrees F rather than at 250 degrees F in a gravity cycle
• b.Storing the eye set in a rigid container instead of in a sequentially wrapped instrument tray
• c.Detergent or enzymatic residue left in cannulas because the final rinse was inadequate✓
• d.Using a chemical indicator strip inside the set rather than an external indicator on the wrap

Toxic anterior segment syndrome is a sterile inflammatory reaction caused by a substance that reaches the anterior chamber, and residues of detergent, enzymatic cleaner, ophthalmic viscoelastic, endotoxin, or metal ions left in tiny cannulas are among the documented sources; copious final rinsing with critical or sterile water addresses them. The two steam parameters listed are both validated cycles and are not associated with the syndrome. Container versus wrap is a packaging decision and does not introduce residue. Indicator placement is a monitoring choice with no chemical effect on the instruments.FDA

Which set of practices reduces the risk of toxic anterior segment syndrome when ophthalmic instruments are reprocessed?

• a.Soak the eye set longer in the same enzymatic bath used for the general orthopedic instruments
• b.Air dry the cannulas overnight after the wash so that any residue evaporates before assembly
• c.Process the eye set in the ultrasonic with every other set so the tank solution stays diluted
• d.Keep eye instruments separate, flush cannulas copiously, and finish with critical or sterile water✓

Recognized practice is to handle ophthalmic instrumentation as a dedicated stream: keep the sets separate from general instruments, clean promptly so residue never dries, flush cannulated pieces with large volumes of fluid, and use critical or sterile water for the final rinse, following the device instructions on detergent choice and on ultrasonic use. Extending a soak in a shared enzymatic bath increases the residue burden. Overnight air drying bakes residue onto the surface rather than removing it, since these residues are not volatile. Sharing an ultrasonic tank with general instruments carries soil and endotoxin onto the eye set.AAMI ST79

A gallon of glutaraldehyde solution is knocked off a shelf and breaks open across the floor of a small workroom. What is the correct response?

• a.Wipe it up with paper towels and rinse the residue down the floor drain with plenty of running water
• b.Prop the door open, turn on a fan, and continue processing while the vapor clears the room
• c.Evacuate and restrict the area, notify the supervisor, and follow the written spill response plan✓
• d.Neutralize it with the enzymatic detergent stored nearby, then mop the area with hot water

A large spill of a high-level disinfectant generates irritating vapor at concentrations a technician's routine protection is not rated for, so the correct sequence is to get people out, keep others from entering, report so the plan and trained responders are activated, and use the spill kit and personal protective equipment the safety data sheet specifies. Paper towels leave the responder standing in vapor and the drain may be an unlawful disposal route. Opening a door and running a fan pushes vapor into adjacent areas while staff keep working in it. Enzymatic detergent is not a neutralizer for glutaraldehyde.AAMI ST58

Under the Spaulding classification, how do the three device categories match to processing levels?

• a.Critical is sterilized, semi-critical is intermediate-level disinfected, non-critical is wiped dry
• b.Critical is high-level disinfected, semi-critical is sterilized, non-critical is simply rinsed
• c.Critical is sterilized, semi-critical gets high-level disinfection, non-critical gets low-level✓
• d.All three categories are sterilized, and the classification only sets the order of processing

Spaulding sorts devices by the risk of the tissue they contact: items entering sterile tissue or the vascular system are critical and are sterilized, items contacting mucous membranes or non-intact skin are semi-critical and receive high-level disinfection at minimum, and items contacting only intact skin are non-critical and receive low or intermediate-level disinfection. Swapping the first two levels would let a device entering sterile tissue be merely disinfected. Intermediate-level disinfection does not meet the semi-critical requirement. Sterilizing everything ignores that the classification exists precisely to set different processing levels.CDC

A vaginal ultrasound probe contacts mucous membranes but does not enter sterile tissue. How is it classified and processed?

• a.Non-critical, so wiping it with a low-level quaternary ammonium product between patients suffices
• b.Semi-critical, so it is cleaned and then given high-level disinfection at minimum per the IFU✓
• c.Critical, so it must be terminally sterilized in a steam cycle before every patient use
• d.Non-critical, so a wipe with seventy percent alcohol between patients is fully sufficient

Mucous membrane contact places the probe in the semi-critical category, so it is cleaned first and then receives high-level disinfection or sterilization as the device instructions permit, with a compatible chemistry. Treating it as non-critical and wiping with a quaternary ammonium product applies low-level disinfection to a device that needs far more. Calling it critical overstates the risk category, and most such probes cannot survive a steam cycle at all. An alcohol wipe is intermediate-level at best, has no cleaning power, and can fix protein and damage the probe housing.CDC

Which statement about disinfectant chemistry is accurate?

• a.Chlorine is an intermediate-level disinfectant that is fast acting but corrosive to many metals✓
• b.Alcohol is preferred for large environmental surfaces because it leaves no residue behind at all
• c.Quaternary ammonium compounds are high-level disinfectants suitable for semi-critical devices
• d.Phenolics are the recommended surface product for infant bassinets and for food contact surfaces

Chlorine compounds act quickly and inexpensively against a broad range of organisms and are used for blood spills, but they corrode metals, are inactivated by organic soil, and degrade in storage. Quaternary ammonium compounds are low-level disinfectants for non-critical surfaces and cannot serve semi-critical devices. Alcohol evaporates too quickly to hold contact time on a large surface, is flammable, and fixes protein, so it is a poor environmental product. Phenolics are specifically discouraged for infant bassinets and for food contact surfaces because of residue and toxicity concerns.CDC

A department is writing its procedure for manual high-level disinfection with a liquid chemical germicide. Which statement belongs in that procedure?

• a.Contact time may be shortened if the concentration test strip reads above the labeled minimum
• b.The item is cleaned and dried first, soaked for the labeled time and temperature, then rinsed✓
• c.Soaking longer than the labeled time is required for lumened items regardless of the label
• d.Rinsing after disinfection is optional when the item will be dried with filtered forced air

Every liquid chemical germicide is cleared for a stated concentration, exposure time, and solution temperature, and the item must be cleaned and dried before immersion so residual water does not dilute the solution below its effective concentration; a thorough rinse follows because the residue is toxic to tissue. A strip reading above the minimum confirms the solution is still usable but does not license a shorter soak. Rinsing is not optional, since forced air dries but does not remove chemical residue. Extending the soak beyond label direction is not a general lumen rule and can damage devices.AAMI ST58

The minimum effective concentration test strip on a glutaraldehyde basin fails on day nine of a fourteen-day reuse life. What is the correct action?

• a.Discard the solution, document the failed result, and refill the basin with fresh solution✓
• b.Consult the supervisor about running the remaining scopes before the shift ends that day
• c.Continue using the solution through day fourteen, since the reuse life printed on the jug governs
• d.Add fresh concentrate to the basin to bring the reading back above the minimum concentration

The reuse life is an outer limit, not a guarantee; dilution from wet instruments and organic load can drop a solution below its minimum effective concentration long before that date, and a failed strip means the solution is discarded and documented, whatever day it is. Asking permission to keep processing requests an exception to a rule the standard states plainly. Relying on the printed reuse date ignores the reason the strip is tested in the first place. Topping off with concentrate is not validated, gives an unknown mixture, and is specifically warned against.AAMI ST58

What must the record show after an endoscope receives high-level disinfection?

• a.Only the date and the reprocessor number, since the cycle printout carries all other details
• b.The surgeon's preference card and the count sheet used when the set was originally assembled
• c.Technician, device identifier, patient or procedure link, exposure time, temperature, and lot✓
• d.The purchase date of the endoscope and the date its next preventive maintenance is scheduled

High-level disinfection records must let the facility connect a specific device to a specific patient and a specific process, so they capture who performed it, which scope by serial or identification number, the patient or procedure it links to, the exposure time and solution temperature, the solution lot and concentration test result, and the reprocessor and cycle. A date and machine number alone cannot trace a scope to a patient during a look-back. Preference cards and count sheets belong to surgical case documentation. Purchase and maintenance dates are asset records, not reprocessing records.AAMI ST91

How are items handled after high-level disinfection is complete and the final rinse has been performed?

• a.Dried thoroughly, then stored and transported in a clean, closed, labeled container or cabinet✓
• b.Returned wet to the case cart, since residual moisture keeps the surface from drying and cracking
• c.Left to drip dry on an open counter and covered with a towel until the department needs them
• d.Sealed wet into a plastic bag right away, so no airborne contamination can reach the device

Residual moisture supports microbial growth and can dilute or defeat the disinfection just performed, so items are dried thoroughly, including alcohol flushing and forced air for channels where the instructions call for it, then kept in a clean closed container or ventilated cabinet with clear labeling and an expiration or use-by convention. Dripping on an open counter under a towel exposes the device to the room. Returning it wet to a cart carries fluid and contamination with it. Sealing a wet device into a bag creates the warmest, wettest growth environment available.AAMI ST91

Which safety measure is required when a technician works with an open basin of ortho-phthalaldehyde?

• a.A cloth surgical mask and examination gloves, which are the standard barrier for this chemistry
• b.Chemical-resistant gloves, eye protection, and a covered basin in an area with proper ventilation✓
• c.No barrier is needed once the basin lid is in place, since a covered basin releases no vapor
• d.A respirator is required for every single use, because the vapor pressure exceeds that of glutaraldehyde

Ortho-phthalaldehyde stains skin and protein gray and irritates the eyes and airway, so it is used with chemical-resistant gloves, eye and face protection, a gown, a covered basin, and ventilation or a fume containment arrangement, with an eyewash within reach and the safety data sheet on hand. A cloth surgical mask and thin examination gloves do not resist this chemistry. A respirator is not the routine control for a covered basin in a properly ventilated space. And a lid reduces vapor but does not remove the need for protection when the basin is opened and items are moved.AAMI ST58