HSPA Sterile Processing (CRCST) — All Questions

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 is acceptable if a second wrapper is applied over it
• d.Cellulose wrap melts at the operating temperature of the sterilizer

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

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

• a.Closed instruments trap air that lowers the chamber pressure
• b.Steam must contact every surface, and closed box locks and ratchets shield the mating surfaces from the sterilant✓
• 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 Class 1 chemical indicator is applied to the outside of every wrapped tray. What does it tell the user?

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

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 5, integrating indicator✓
• b.Class 1, process indicator
• c.Class 4, multi-variable indicator
• d.Class 3, single-variable 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 indicator that replaces the daily biological indicator
• b.An external indicator used to identify the sterilizer number
• c.An emulating indicator designed and verified for one specific cycle, reacting to all critical variables at the stated values of that cycle✓
• d.An indicator used only in ethylene oxide sterilizers

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

• a.A quick visual scan under overhead lighting, since the washer verifies cleanliness
• b.Testing only the instruments that were flagged by the operating room on the count sheet
• c.Lighted magnification, examining each instrument for cleanliness, cracks, pitting, alignment, and proper function before assembly✓
• 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 holding the blades up to the light to check for gaps
• b.By running a fingernail along the blade edge
• c.By opening and closing the scissors to check the pivot screw only
• d.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✓

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

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.Nest all concave items facing upward so they hold their position
• b.Lock all ratcheted instruments closed so they do not shift in the tray
• 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.Write the contents on the paper side with a ballpoint pen
• d.Fold the pouch over to fit a long instrument and seal it with tape

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 weighs less than 5 pounds when empty
• 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 has been polished and is free of fingerprints

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.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✓
• b.The technician name only
• c.The expiration date only, with no other information
• d.The patient name and procedure date only

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 load has just finished and a technician needs to move a rigid container off the sterilizer cart to make room. What protects the technician from a burn?

• a.Run cool water over the container lid for a few seconds so the metal can be gripped bare-handed.
• b.Move the container with both hands quickly, so contact with the hot metal surface stays brief.
• c.Aim a fan at the cart to speed the cooling, then lift the container with a folded huck towel.
• d.Let the load cool undisturbed on the cart, using heat-resistant gloves if it must be moved sooner.✓

Items coming off a sterilizer are hot enough to cause a contact burn, and the load is also fragile while it cools, so it is left undisturbed on the cart in a low-traffic area and handled with heat-resistant gloves only when it truly must be moved. Running cool water over a hot container thermally shocks the metal and drives moisture onto packages that are still cooling. Moving it fast with bare hands still transfers heat and invites a dropped container. Blowing a fan across a cooling load pulls room air and particulate over the packages and can draw contaminants through a still-damp wrapper.AAMI ST79

Water is dripping from a cart onto the floor between the sterilizer discharge area and the assembly counter. What should the technician do?

• a.Set out a wet-floor sign, dry the area at once, then find and correct the source of the dripping.✓
• b.Step around the puddle and let it dry, since the tile in that corridor evaporates within an hour.
• c.Cover the water with absorbent towels and leave them in place until housekeeping reaches the unit.
• d.Reroute foot traffic through the sterile storage doorway until the floor can be mopped at shift end.

A wet floor in a work area is a slip hazard that the technician who finds it is expected to control immediately: warn others with a sign, dry the area, and then trace the leak, because a dripping cart also signals a failed gasket, an overloaded cart, or wet packages. Waiting for evaporation leaves the hazard in a walkway used with loaded carts. Towels left on the floor become a trip hazard themselves and stay wet, and they do nothing about the source. Rerouting traffic through sterile storage moves clean traffic into a controlled area and still leaves the water there for the rest of the shift.OSHA 29 CFR 1910.22

During assembly a technician finds a knife handle in the tray with the blade still mounted on it. What is the correct handling?

• a.Grip the blade with a gloved thumb and forefinger and drop it into the red biohazard bag nearby.
• b.Send the entire tray back to decontamination so the blade can be pulled off at the cleaning sink.
• c.Snap the blade off against the counter edge and sweep the pieces into the regular waste container.
• d.Use a single-handed blade remover or an instrument to drop the blade into a sharps container.✓

Sharps are handled by mechanical means, not fingers, so the blade is removed with a single-handed removal device or an instrument and dropped straight into a puncture-resistant sharps container at the workstation; the finding is then reported so the procedural area corrects its point-of-use practice. Pinching a blade with gloved fingers is the classic mechanism of a prep-area injury, and a biohazard bag is not puncture resistant. Sending the tray back only moves an already-decontaminated sharp to another person. Snapping the blade against the counter scatters a contaminated fragment and puts a sharp in general waste.OSHA 29 CFR 1910.1030

The first test seal of the day on the pouch sealer shows an incomplete seal with an open channel running across it. What should the technician do?

• a.Raise the temperature setting by twenty degrees and keep sealing, since a channel means it ran cool.
• b.Reseal each pouch a second time at a slower feed rate and inspect every seal before it is loaded.
• c.Take the sealer out of service, tag it, and report it to the supervisor so it can be repaired.✓
• d.Switch to self-seal pouches for the rest of the shift and log the failed test on the equipment record.

A failed daily seal check means the sealer cannot be shown to produce an intact sterile barrier, so it is removed from service, tagged, and reported for repair or adjustment by the people authorized to service it; this is the defined path for a piece of equipment that fails its own quality test. Double sealing a pouch on a machine known to be defective produces two unverified seals, not one good one. Guessing at a temperature change is an uncontrolled adjustment outside the pouch manufacturer's stated range. Switching to self-seal pouches and logging the failure hides a broken machine that the next shift will use.AAMI ST79

Why does a department add a borescope, or scope inspector, to its inspection of lumened instruments and rigid scope channels?

• a.It shows the inside of a channel, where retained soil, scratches, and dents cannot otherwise be seen.✓
• b.It measures the internal diameter of a channel so the correct cleaning brush size can be selected.
• c.It confirms the channel is dry after the drying phase and posts that result to the tracking system.
• d.It verifies that sterilant reached the lumen by reading an indicator placed inside the channel.

A borescope is a lighted optic that lets a technician look down the length of a lumen or channel, which is exactly where lighted magnification and the naked eye cannot reach; it reveals retained soil, scratches, dents, burrs, and corrosion that would otherwise be released to a patient. Brush size comes from the device instructions, not from the scope. A borescope may incidentally show moisture, but it is an inspection tool, not a validated dryness test, and it does not feed results to a tracking system on its own. Sterilant contact inside a lumen is judged with indicators and cycle records, not with an optic.AAMI ST91

How often must the work surface at the preparation and packaging assembly station be cleaned and disinfected?

• a.Once each day by environmental services, on the same schedule used for sterile storage shelving.
• b.Weekly, because prep is a clean area and everything placed on the counter is already decontaminated.
• c.At the start of each shift, before the first tray is built, and again whenever the surface is soiled.✓
• d.After each tray is wrapped, using a sporicidal disinfectant held at a ten-minute wet contact time.

Work surfaces in preparation and packaging are cleaned and disinfected at the beginning of each shift before assembly starts, and again any time they become soiled, so that clean, inspected instruments are never set down on a contaminated counter. Leaving it to a single daily environmental services pass ignores what happens during the shift and puts the timing outside the technician's control. A weekly schedule wrongly assumes that clean items cannot soil a surface, when lint, lubricant, and residue accumulate constantly. A sporicidal wipe after every tray is neither required nor practical, and the long wet time would idle the station.AAMI ST79

Why does the inspection and assembly workstation need a higher level of illumination than the general prep area?

• a.Finding residual soil, cracks, and pitting on small surfaces depends on the light reaching them.✓
• b.Bright light is needed to read count sheets and load labels correctly while packages are built.
• c.The extra light lets the technician confirm indicator tape has changed to its processed color.
• d.Higher illumination shortens the time a tray sits open on the counter and reduces airborne fallout.

Inspection is a visual task performed on very small features, so the standard calls for stronger, glare-free illumination at the inspection surface than in the general work area, supplemented by lighted magnification; soil in a serration, a hairline crack, or early pitting simply is not visible at general room light. Light level has no effect on how fast a tray is built or on airborne particulate. Reading a count sheet or a label is easy at ordinary room light and is not what drives the requirement. Confirming a color change on external tape is a gross visual check that also does not require inspection-level lighting.AAMI ST79

Why are indicators, tip protectors, liners, and wrap stocked at the station before assembly begins?

• a.So the supplies reach room temperature and cannot cause condensation inside the closed package.
• b.So the supplies can be counted at the end of the shift against the number of trays that were built.
• c.So the technician does not leave a partly built, open tray on the counter to go hunt for supplies.✓
• d.So the tray can be wrapped at once, without waiting for the sterilizer to finish its current cycle.

Assembly is stocked in advance so that the process runs without interruption: an open tray abandoned on a counter while the technician searches for a missing integrator or tip protector is a set that can be contaminated, disturbed, or finished by someone who does not know what is already in it. Counting supplies against trays built is an inventory exercise, not the reason to stock the station. Wrap and indicators are stored in the same room and are already at room temperature. Sterilizer availability has nothing to do with whether the packaging supplies are at hand when the tray is assembled.AAMI ST79

A technician wants to add an absorbent liner to the bottom of a heavy orthopedic tray to control condensate. What governs that decision?

• a.The set weight, since a liner is added to any tray over twenty-five pounds to take up the moisture.
• b.Department preference, because a folded huck towel out of clean linen serves the same drying purpose.
• c.The tray or container instructions for use, which state which liners are validated for that tray.✓
• d.The last cycle printout for that tray, which shows whether the load previously needed a longer dry time.

Liners, mats, and absorbent inserts are part of the packaging system, and the tray or rigid container manufacturer validates which ones may be used with its product, so the instructions for use decide the question. Weight alone does not authorize adding material a container was not tested with, although a heavy set is exactly the situation where drying problems appear. A huck towel is a textile with its own lint, laundering, and absorbency variables and is not an equivalent substitute for a validated liner. A cycle printout records what the sterilizer did and says nothing about which liner the container was cleared for.Device IFU

Why must the assembly counter be kept clear of extra supplies, paperwork, and personal items?

• a.Clutter blocks the laminar airflow that is directed downward across the assembly counter surface.
• b.Clutter hides small parts and loose screws and keeps the surface from being cleaned properly.✓
• c.Paper products on the counter shed cellulose that will abort a hydrogen peroxide sterilizer cycle.
• d.Supplies stored on the counter expire sooner because of the light and warmth at the workstation.

A clear counter is both an accuracy control and a cleaning control: a screw, a tip protector, or a small instrument disappears under stacked material and ends up missing from a set, and a covered surface cannot be wiped down between trays. Preparation and packaging is a positive-pressure clean area but is not a laminar-flow space, so clutter is not blocking a downward air curtain. Room light and temperature do not shorten the dated shelf life of packaging supplies. Cellulose matters inside a hydrogen peroxide chamber, not sitting on a counter, and paper on the counter does not reach the sterilizer.AAMI ST79

The lighted magnifier at a technician's assembly station has burned out and trays are backing up. What is the correct action?

• a.Keep inspecting under the overhead room lights and re-inspect those sets once the lamp is replaced.
• b.Move the trays to the sterilizer area and inspect them under the task light at the loading counter.
• c.Borrow the handheld magnifier from the office desk and work through the backlog before shift end.
• d.Stop using that station, tag the lamp, and report it to the supervisor so a repair is arranged.✓

Lighted magnification is required equipment for inspection, so a station without it is a station that cannot be used for that task; the lamp is tagged and reported through the equipment repair path while the work moves to a station that is fully equipped. Inspecting under general room light and promising a second look later releases sets that were never properly inspected. The sterilizer loading counter is a different work area with different lighting and traffic, and moving trays there does not restore magnification. An office magnifier is unlighted, uncalibrated, and not the equipment the department validated for inspection.AAMI ST79

At assembly, a technician finds dried blood inside the box lock of a clamp taken from an otherwise clean-looking set. What is correct?

• a.Return the clamp to decontamination for complete reprocessing before it goes back into the set.✓
• b.Spray the box lock with enzymatic pre-treatment at the counter, work the joint, and then dry it.
• c.Package it and rely on the cycle, since steam reaches the mating surfaces of an open box lock.
• d.Notify the supervisor and package the set with a note describing the soil found in the box lock.

Visible soil at assembly means the item is not clean, and an item that is not clean cannot be sterilized, so it goes back through the full decontamination process; the rest of the set is evaluated the same way, since one soiled box lock suggests a cleaning process problem. Escalating and packaging it anyway is dodging a duty the technician already has, because removing a soiled item from the clean workflow is the technician's own defined responsibility. Pre-treatment spray at the assembly counter puts contaminated fluid on a clean work surface and does not clean the joint. Steam does not clean; residual soil shields organisms from it.AAMI ST79

A retractor reaches assembly with sticky tape residue along the handle. What does that mean for the item?

• a.It is acceptable if the residue is away from the working end, since the tape covered a smooth surface.
• b.It is not clean, because adhesive traps soil and blocks sterilant contact, so it must be reprocessed.✓
• c.It is acceptable once the residue is picked off with a fingernail and the area is wiped with alcohol.
• d.It should be covered with fresh identification tape, which seals the residue away from the sterilant.

Adhesive residue is soil: it is tacky, it collects lint and organic debris, and it forms a barrier between the sterilant and the metal, so the instrument is returned to decontamination and the residue removed with a product the instrument manufacturer permits. Location on the handle does not help, because the whole device must be sterile and the handle is what staff grip. Picking residue off with a fingernail at the assembly counter is neither effective nor safe and leaves an unverified surface. Taping over residue buries the contamination under another layer and adds a second barrier for the sterilant to cross.AAMI ST79

An orthopedic set returns with hardened bone cement on a rasp and on an osteotome. How should it be handled?

• a.Scrape the cement off with a metal instrument at the counter, then wipe the surfaces with alcohol.
• b.Run the set through the ultrasonic cleaner a second time, which dissolves polymethyl methacrylate.
• c.Assemble the set as is, because cured bone cement is an inert polymer that steam penetrates well.
• d.Send it for cement removal per the instructions for use, since it must come off before sterilization.✓

Cured bone cement is a hard polymer bonded to the surface; it hides soil underneath, prevents sterilant contact, and can flake off during a case, so the item is removed from service and the cement taken off by the method the manufacturer permits, often by the repair vendor. Prevention is better still, since cement is wiped off at point of use before it sets. Scraping with a metal instrument gouges the finish and destroys the passive layer, inviting corrosion. Cured cement is not sterilized through, and no ultrasonic cycle dissolves polymethyl methacrylate, so a second pass through the ultrasonic simply wastes time.Device IFU

Several instruments show a brown-orange film that wipes away and leaves smooth, unmarked metal underneath. How is that read?

• a.As early rust, which requires the instruments to be pulled from service and sent out for repair.
• b.As a surface deposit rather than rust, commonly traced back to water quality or detergent residue.✓
• c.As dried blood from inadequate cleaning, requiring the whole set to be returned to decontamination.
• d.As the normal chromium oxide layer, which re-forms after each cycle and needs no follow-up at all.

A brown-orange discoloration that lifts off and leaves sound metal behind is staining, that is, a deposit lying on the surface, and it usually points to mineral content in the water, detergent carryover, or a rinse problem, so the fix is in the process rather than the instrument. True corrosion does not wipe away and leaves pitting or roughness where the metal itself has been attacked. Dried blood is dark, adherent, and concentrated in serrations and box locks, not spread as a uniform film. The passive chromium oxide layer is invisible and protective, so a visible colored film is not simply that layer showing itself.AAMI ST79

Instruments from one washer come out with a rainbow-colored sheen, but with no pitting or roughness. What is the usual cause?

• a.Prolonged contact with a cold chemical disinfectant, which leaves a blue-gray cast on the metal.
• b.A thin surface film from detergent residue or mineral deposits, corrected by adjusting the process.✓
• c.Loss of the passive layer from chloride exposure, which means the instruments have to be replaced.
• d.An electrolytic reaction from mixing dissimilar metals in the ultrasonic, which plates one on another.

A multicolored or rainbow sheen is a very thin film on the surface, typically from detergent that was not fully rinsed away or from minerals in the rinse water, and it is corrected by checking detergent dosing, rinse quality, and water treatment rather than by discarding instruments. A blue-gray cast is the pattern associated with prolonged exposure to cold chemical disinfectant solutions. Blue-black plating is what dissimilar metals in a shared ultrasonic bath produce. Chloride attack on the passive layer shows up as pitting and corrosion, and the stem specifically states the surfaces are smooth.AAMI ST79

What distinguishes staining from corrosion on a stainless steel instrument?

• a.Staining is colored while corrosion is colorless, so any discolored instrument has only been stained.
• b.Staining follows steam sterilization, while corrosion appears only after chemical disinfection is used.
• c.Staining sits on the surface, while corrosion eats into the metal and shows as pitting or roughness.✓
• d.Staining occurs on chrome-plated instruments and corrosion occurs only on solid stainless items.

The practical test is whether the metal itself has been damaged: a stain is a deposit or film lying on an intact surface and can often be removed, while corrosion is destruction of the metal that leaves pits, roughness, or flaking and means the instrument comes out of service. Both staining and corrosion can follow either steam processing or chemical exposure, so the process used does not sort them. Color is not the discriminator either, since corroded areas are usually the most discolored spots on the instrument. Both plated and solid stainless instruments stain, and both corrode once the passive layer is breached.AAMI ST79

How should the cutting edges of osteotomes, curettes, and rongeurs be verified during inspection?

• a.On the test material the manufacturer specifies, such as a plastic test rod for a chisel-type edge.✓
• b.By cutting four layers of gauze with the distal third of the edge, the way scissors are tested.
• c.By drawing the edge across a gloved fingertip to feel whether it still catches on the glove material.
• d.By comparing the edge under lighted magnification against a new instrument with the same catalog number.

Sharpness testing is done on the test medium the instrument manufacturer specifies for that instrument type, because a chisel edge, a curette cup, and a rongeur jaw all cut differently; plastic test rods and manufacturer test blocks are the common media, and results are recorded. Testing an edge against a gloved finger risks a cut and a glove breach and tells the technician nothing reliable. Layered gauze is the accepted medium for scissors, not for bone instruments, and would not challenge an osteotome. Visual comparison under magnification finds chips and nicks but cannot demonstrate that the edge still cuts.Device IFU

Why does a pinhole in the insulation of a laparoscopic electrosurgical instrument matter?

• a.Fluid works in through the defect and corrodes the shaft, shortening the working life of the device.
• b.The defect shifts the impedance, so the generator delivers less power than the surgeon has selected.
• c.Soil enters the shaft through the defect, where cleaning brushes and detergent cannot reach it.
• d.Stray current escapes through the defect and burns tissue outside the surgeon's own field of view.✓

Insulation is what confines electrosurgical current to the active tip, so a break anywhere along the shaft gives current an alternate path to whatever tissue happens to touch it; because the shaft is usually outside the camera view, the resulting full-thickness burn to bowel or vessel is often not recognized during the case. Fluid ingress and internal soil are real consequences of a damaged device, but they are maintenance and cleaning concerns rather than the patient-injury mechanism that drives insulation testing. A pinhole leaks current away rather than reducing the power the generator delivers to the tip.AAMI ST79

An insulation tester alarms on a reusable laparoscopic instrument that is needed for a case in about an hour. What should the technician do?

• a.Remove it from service, tag it as failed, and document it so a replacement goes into the set.✓
• b.Wrap the defect with insulating tape, retest the shaft, and return it to the set once it passes.
• c.Retest at a lower voltage setting, since a high setting gives false alarms on thin shaft insulation.
• d.Consult the supervisor about releasing it for this one short case and retesting it again tomorrow.

A failed insulation test is a defined, unambiguous result: the device is removed from service, tagged, sent for repair or replacement, and the action is documented so the set record and count sheet stay accurate. Taking the failure to a supervisor for permission to use it anyway is escalation used to dodge a duty the technician already owns, and no one can authorize releasing a device known to be defective. Insulating tape is not a validated repair and cannot restore a tested dielectric barrier. Lowering the test voltage below the level the tester specifies simply hides the defect instead of finding it.AAMI ST79

How is a needle holder checked for worn jaws during inspection?

• a.Clamp a suture needle and pull it straight out; a needle that slides free means the jaws are worn.
• b.Close it fully and check that the ring handles meet flush, which shows the jaws are still aligned.
• c.Close it on the first ratchet and hold it to the light; light visible between the jaws means wear.✓
• d.Tap the ring handles on the counter after closing the last ratchet to see whether it springs open.

Worn needle holder jaws are found by closing the instrument on the first ratchet and holding it up to a light source: any light passing between the jaw faces means the gripping surface is worn and the needle will turn during suturing, so the instrument goes for repair. A needle may also be clamped and twisted, and it should not rotate. Ring handles meeting flush says nothing about the condition of the jaw faces. Pulling a needle straight out tests friction along the wrong axis and can bend the needle. Tapping the handles on a hard surface is the ratchet test, which checks the ratchet rather than the jaws.AAMI ST79

A technician inspects hinged instruments before assembly. Which finding means the instrument must be pulled from the set?

• a.The box lock moves through its full range without binding as the instrument is opened and closed.
• b.The ratchet holds at the first tooth when the ring handles are tapped against the palm of the hand.
• c.The shank carries a faint identification tape band placed well behind the jaws and the box lock.
• d.The tips fail to meet when closed, or the teeth do not mesh, so tissue would slip out of the jaws.✓

Tip approximation and jaw alignment are pass-or-fail: if the tips do not meet or the teeth do not interdigitate, the instrument cannot hold tissue or a vessel, so it is removed from the set, tagged, and sent for repair. A box lock that moves freely through its range without binding is a normal, passing finding. A ratchet that holds at the first tooth when the handles are tapped is also a pass; failure is the ratchet springing open. Identification tape placed on the shank clear of the box lock, jaws, and serrations is acceptable, provided it is intact and has not begun to lift or fray.AAMI ST79

A technician finds a hemostat with a cracked box lock while building a set that is due in the operating room shortly. What is the correct process?

• a.Remove it, tag it for repair, put a replacement in the set, and record the exchange in the record.✓
• b.Ask the supervisor whether the cracked clamp may go in just this once, since the set is due soon.
• c.Leave it in and mark the count sheet, so the operating room staff know the box lock is cracked.
• d.Drop it in the repair bin and send the set out one instrument short, without any further record.

A cracked box lock can fail in a patient, so the instrument comes out of service, gets tagged, is replaced from inventory, and the exchange is documented; documentation is what keeps the count sheet, the set configuration, and the repair record in agreement. Asking permission to package a broken instrument is escalation used to sidestep a duty the technician already carries, and time pressure does not change the standard. Marking the count sheet and sending the crack forward puts the decision on the operating room during a case. Silently shorting the set leaves the next technician with an unexplained discrepancy.AAMI ST79

Why are mineral oil and penetrating-oil products prohibited as surgical instrument lubricants?

• a.They break down above 250 degrees F and leave a carbon residue that stains the sterilizer chamber.
• b.They void the warranty on hinged instruments, even though they lubricate a box lock effectively.
• c.They are not water soluble, so they leave a film that steam cannot penetrate to reach the metal.✓
• d.They are acceptable only after sterilization, once the set has cooled at the end of the dry cycle.

Petroleum-based products are not water soluble and are not steam penetrable, so they leave an occlusive film that keeps steam off the surfaces underneath and can protect any organisms trapped there; instrument lubricant must be a water-soluble, steam-penetrable milk applied after cleaning and rinsing and before sterilization, per the instructions for use. Chamber staining is a trivial concern next to a device that is not sterilized. Warranty language is not the reason the practice is prohibited. Lubricating after sterilization would recontaminate the set, and no lubricant substitutes for cleaning a joint that is stiff with soil.Device IFU

What is the primary function of a count sheet during tray assembly?

• a.It carries the cleaning instructions that the decontamination staff follow for each instrument.
• b.It records which technician sterilized the load and which cycle parameters the sterilizer ran.
• c.It documents the charge for each instrument so the case can be billed to the correct patient.
• d.It lists the exact contents and configuration, so each set is built and verified the same way.✓

A count sheet, sometimes called a tray list or recipe, states exactly which items and how many of each belong in a set and how they are arranged, so that assembly is reproducible, the contents can be verified before wrapping, and any shortage can be identified and reported. Operator identity and cycle values live on the load record and sterilizer printout, not on the count sheet. Instrument charges are handled by the billing and inventory systems. Cleaning instructions come from each device manufacturer and are used in decontamination well before the count sheet is picked up in assembly.AAMI ST79

An instrument listed on the count sheet is missing and cannot be located anywhere in the department. What is correct?

• a.Substitute the closest instrument in inventory and update the count sheet to match what was used.
• b.Build the set without it and leave the count sheet unmarked, since the operating room will notice.
• c.Record the shortage, flag the set as incomplete, and notify the supervisor to obtain a replacement.✓
• d.Hold the set out of circulation until the instrument turns up, even though a case is scheduled today.

A missing item is documented on the count sheet and in the tracking record, the set is flagged so the operating room knows what it is receiving, and the shortage is passed to the supervisor, who controls purchasing, loaner arrangements, and set configuration; obtaining a replacement is not the assembling technician's decision to make alone. Quietly swapping in a different instrument and rewriting the count sheet changes the set configuration without authorization. Sending an unmarked short set makes the discovery happen during a case. Holding the set hostage while a case waits withholds usable instruments instead of communicating.AAMI ST79

A technician cannot identify an unfamiliar clamp that came back in a general set. What is the correct way to identify it?

• a.Compare it with the closest instrument in the tray and use that name on the count sheet for now.
• b.Measure it, read any etched name or number, and match it against a catalog or instrument database.✓
• c.Place it in the set as an extra and let the operating room name it when the tray is opened for a case.
• d.Send it to the loaner room, since an instrument nobody recognizes arrived with some vendor's tray.

Identification is done by evidence: measure the instrument in centimetres or inches, read the etched manufacturer name and catalog number, note the pattern of the jaws and ratchet, and cross-reference that against a manufacturer catalog, the department's instrument database, or the tracking system record. Naming it after the instrument that looks closest puts a wrong name into a permanent record and into every future count. Adding it as an unidentified extra leaves the identification to people who are busy with a patient. Assuming it belongs to a vendor without checking risks losing a facility-owned instrument.AAMI ST79

Where may instrument identification tape be applied, and when must it be replaced?

• a.On the shank, clear of box locks, jaws, and serrations, and replaced once it lifts, frays, or fades.✓
• b.On the jaw surface, where staff can see it during a case, and replaced once each year under policy.
• c.On the ring handle in several layers, so the color band is thick enough to survive the washer cycle.
• d.Over the box lock, where it stays put the longest, and replaced only when the instrument is repaired.

Marking tape is applied to a smooth area of the shank where it does not cover a box lock, a jaw, or serrations, because tape over a moving or mating surface both blocks the sterilant and interferes with function; it is inspected each time and removed and replaced as soon as it lifts, frays, cracks, or discolors, since a loose edge harbors soil. Tape over the box lock covers the single hardest place for steam to reach. Tape on a jaw sits on the working surface and can enter the patient. Multiple thick layers create a bulky barrier; laser etching avoids the layer entirely.AAMI ST79

Which tip protector is appropriate for a delicate microsurgical instrument packaged in a wrapped tray?

• a.One that is vented and sterilant permeable, sized so that it does not squeeze the delicate tip.✓
• b.A length of moistened gauze wound around the tip and secured in place with identification tape.
• c.A snug solid cap that grips the tip firmly, so it cannot slide off during transport and handling.
• d.A rigid sleeve sealed at the far end, which keeps condensate off the tip during the dry phase.

Tip protectors are permitted only when they are vented or made of a sterilant-permeable material and are correctly sized, because the whole point of packaging is that the sterilant must reach every surface, including the one under the protector; a protector that is too tight also bends or dulls the very tip it is meant to guard. A solid gripping cap seals the tip away from steam. Moistened gauze holds water against the metal and adds an uncontrolled variable. A sleeve sealed at one end traps an air pocket, which is exactly what prevents steam contact and produces a wet, unsterile tip.AAMI ST79

A technician replaces the foam pad in a rigid container and wants to reuse the old pad in a different tray. What applies?

• a.Foam may be reused until it stops springing back, since it is sterilized again in every cycle anyway.
• b.Foam and mats follow the container instructions, and are replaced once torn, stained, or expired.✓
• c.Foam may be moved between containers of the same brand, provided the sizes are trimmed to match.
• d.Foam is single use in steam but reusable in hydrogen peroxide, where there is no condensate load.

Foam pads, silicone mats, and tray liners are accessories that the container or tray manufacturer validates, so their material, reuse limits, and replacement criteria come from the instructions for use, and a pad that is torn, compressed, stained, or past its stated life is discarded. Springiness is not the criterion, and running foam through more cycles does not restore it or make contamination irrelevant. Cutting a pad to fit another container changes a validated component and can shed particulate. The single-use-in-steam idea reverses the real concern, since cellulose-containing material is what hydrogen peroxide will not tolerate.Device IFU

How should basins, bowls, and other dished items be positioned in a set for steam sterilization?

• a.Stacked flat and nested with a towel between them, so the stack stays stable during transport.
• b.Tilted or set on edge, so that condensate runs out instead of pooling in the concave surface.✓
• c.Opening upward, so that steam settles down into the bowl and contacts the entire inner surface.
• d.Face down flat on the tray bottom, so the sealed air space underneath keeps the inside dry.

Concave items are positioned on edge or tilted so that condensate formed during the cycle drains away by gravity instead of collecting in the dish, which is the classic cause of a wet pack and of a package that must be reprocessed. Nesting bowls traps air and moisture between the surfaces and prevents steam contact, even with a towel between them. Steam does not settle downward into an upturned bowl the way water would, and an upright bowl becomes a reservoir for condensate. A bowl placed face down flat against the tray traps an air pocket that steam cannot displace.AAMI ST79

A suction handle with a removable stopcock and a trocar with a seal cap are being packaged. What is required?

• a.Disassemble them as the instructions direct, so sterilant reaches the mating and threaded surfaces.✓
• b.Disassemble them only when the separate parts still fit the tray configuration on the count sheet.
• c.Assemble them so the parts are not lost, since the pieces are validated as an assembled device.
• d.Leave the seal cap loosened by a half turn, which vents the device while keeping the parts together.

Multi-part devices are taken apart to the degree the manufacturer's instructions specify, because threaded joints, mating surfaces, and the space beneath a seal or stopcock are inaccessible to steam while the device is assembled, and those instructions also dictate how the parts are held together in the tray. Packaging a device assembled to avoid losing parts is precisely what leaves those surfaces unprocessed. Tray configuration is adjusted to the instructions, not the other way around. A half-turn loosening is an improvised compromise that is not validated and can let the cap fall off in the chamber.Device IFU

A technician threads twenty-five hemostats tightly onto one stringer and closes their ratchets to save room. What is wrong?

• a.The closed ratchets and the crowded instruments block steam from reaching the jaws and the box locks.✓
• b.Nothing is wrong, since a dynamic-air-removal cycle pulls steam into closed box locks in any case.
• c.The set will be over its weight limit, because a loaded stringer of hemostats alone exceeds 25 pounds.
• d.The stringer itself is rated for ten instruments, and above that its retaining pin can bend or break.

A stringer or rack exists to hold hinged instruments open and separated so that steam reaches every surface, so closing the ratchets and packing the instruments against one another defeats the device and leaves the mating surfaces of the box locks and jaws unexposed. Stringers do not carry a ten-instrument rating; the limit is whatever still lets the instruments hang open and apart. A dynamic-air-removal cycle removes air from the chamber and package but cannot force steam into a closed box lock. Twenty-five hemostats weigh far less than the weight limit, so mass is not the problem here.AAMI ST79

Where is the internal chemical indicator placed in a multi-level instrument tray?

• a.In the top level beside the count sheet, where staff will see it first as the tray is opened up.
• b.In each level, in the spot judged least accessible to the sterilant for that particular package.✓
• c.Under the external indicator tape on the wrapper, so the two results can be compared side by side.
• d.In the level holding the heaviest instruments, the last part of the tray to come up to temperature.

An internal indicator is placed in the area of the package the sterilant is expected to reach last, and a multi-level tray gets one in every level, because each level is its own challenge; a pass tells the user that the sterilant reached that point under those conditions, and it does not by itself prove the contents are sterile. Placing it beside the count sheet on top puts it in the easiest location to reach. Tucking it under the external tape leaves the inside of the package unmonitored entirely. Weight is only one factor in accessibility, so the heaviest level is not automatically the hardest to reach.AAMI ST79

A box of internal indicators is labeled for a dynamic-air-removal cycle at 270 degrees F for 4 minutes. May it be used in a 250-degree gravity load?

• a.Yes, because a gravity cycle is longer and milder than the cycle the indicator was designed for.
• b.No, since an indicator is used in the cycle it is labeled for, its response set for those values.✓
• c.Yes, if the indicator is a multi-variable type, which responds to any mix of time and temperature.
• d.No, unless a second indicator of a different class is added to that package for a comparison.

Chemical indicators are manufactured and labeled for stated cycle types and values, so an indicator verified for a dynamic-air-removal cycle at 270 degrees F for 4 minutes cannot be relied on to report correctly in a 250-degree gravity load; the department selects an indicator labeled for the cycle actually being run. A longer, cooler cycle is not automatically a milder challenge, and that reasoning is not how the indicator was validated. A multi-variable indicator responds to several variables at its own stated values, not to any combination. Adding a second indicator does not make an unsuitable one valid for that cycle.AAMI ST79

A completed orthopedic set weighs 31 pounds with its tray. Why is that a problem, and what should be done?

• a.It passes the lifting limit OSHA sets for one person, though the cycle itself is not affected by it.
• b.It passes the 25-pound recommendation; the added mass holds condensate, so the set gets divided up.✓
• c.It passes the 25-pound recommendation, which counts the instruments alone and not the tray itself.
• d.It passes the sterilizer shelf rating, so the load has to be run on the bottom shelf over the drain.

The recommended limit for a wrapped instrument set is about 25 pounds for the tray and its contents together, and that figure exists because a heavy metal mass takes longer to heat, holds far more condensate, and often will not dry within the cycle, producing wet packs; the fix is to split the set into two trays and distribute the mass evenly rather than piling it at one end. Handling injury is a real concern but is not the sterilization rationale. Counting only the instruments would ignore the mass of the tray, which behaves the same way. Sterilizer shelves are not what the 25-pound figure describes.AAMI ST79

Which peel pouch is appropriate for a camera head going into a vaporized hydrogen peroxide cycle?

• a.A Tyvek and film pouch cleared for hydrogen peroxide use✓
• b.A kraft paper envelope sealed along its flap with tape
• c.A muslin lined pouch closed with two strips of indicator tape
• d.A paper and film peel pouch of the kind used for steam loads

Hydrogen peroxide is absorbed by cellulose, so a peroxide load must be packaged in synthetic materials only. Tyvek, a flash-spun polyethylene, bonded to a plastic film is the peel pouch cleared for gas plasma and vaporized hydrogen peroxide cycles. The paper-faced pouch used for steam has a cellulose face that soaks up the sterilant and aborts the cycle. Muslin is cotton, another cellulose, and tape is not a validated closure on a pouch. Kraft paper is cellulose as well, so that envelope fails for the same reason.AAMI ST58

Which requirement applies to the packaging selected for an ethylene oxide load?

• a.It must be a nonporous film that keeps moisture off the device
• b.It must let both ethylene oxide gas and humidity pass through✓
• c.It must be aluminum foil, which holds the gas against the load
• d.It must be free of cellulose, as in a hydrogen peroxide cycle

Ethylene oxide sterilizes only where the gas and the humidity of the conditioning phase can reach the device, and that same permeability is what lets residual gas leave during aeration. Paper, nonwoven polypropylene, muslin and Tyvek pouches all qualify. A nonporous film blocks the gas going in and traps residual gas going out, which is a patient safety hazard. Aluminum foil is a barrier used in dry heat, not a package for a gas process. The cellulose ban belongs to hydrogen peroxide processes; paper packaging is perfectly acceptable in ethylene oxide.AAMI ST41