CRCST Sterilization Process Practice Test

25 practice questions

Choose an answer, then check it under Show answer.

1. Question 1 of 25Easy

   Before applying any cleaning agent to the interior surfaces of a steam sterilizer chamber, what safety precaution must the technician take?

   1. AA. Coat the interior chamber walls with a silicone barrier spray
   2. BB. Vent the chamber jacket using a manual blowdown valve
   3. CC. Run an empty vacuum cycle using an enzymatic solution
   4. DD. Allow the sterilizer chamber to cool down completely
   Show answer to question 1

   Answer: D. Allow the sterilizer chamber to cool down completely

   Sterilizers must be allowed to cool before chamber cleaning to protect the technician from serious burn injuries and to prevent rapid evaporation or vaporization of cleaning chemicals. Cleaning solutions applied to hot metal surfaces can release hazardous fumes and leave baked-on chemical residues. Manual blowdown procedures or chemical cycles are not part of routine technician chamber cleaning.

2. Question 2 of 25Medium

   A steam sterilizer aborts during the conditioning phase and prints an error code indicating excessive time to reach temperature at the chamber drain. What is the most common operational cause of this error?

   1. AA. An exhausted supply of boiler feed water in the facility
   2. BB. A chamber drain screen blocked with lint, tape, or debris
   3. CC. A cracked door gasket allowing ambient air into the vessel
   4. DD. Overheating of the steam pressure regulator in the jacket
   Show answer to question 2

   Answer: B. A chamber drain screen blocked with lint, tape, or debris

   The chamber drain screen prevents debris from entering the drain line where the temperature sensing element is located. If this screen is clogged with debris, tape, or sediment, cool air and condensate cannot exit freely, preventing the drain sensor from reaching the programmed exposure temperature within the specified time limit. While door gasket failures cause vacuum leaks, drain temperature delays are most frequently caused by blocked drain screens.

3. Question 3 of 25Easy

   What does a Bowie-Dick type test show about the steam sterilizer in which it is run?

   1. AA. Whether the items in the load reached sterility during steam exposure
   2. BB. Whether air was removed so that steam penetrated quickly and evenly
   3. CC. Whether the drying phase left the packs dry enough for storage
   4. DD. Whether bacterial spores in the load were killed during exposure
   Show answer to question 3

   Answer: B. Whether air was removed so that steam penetrated quickly and evenly

   A uniform color change on the test sheet shows that air was removed from the chamber and test pack so that steam penetrated quickly and evenly. A failure can reveal air leaks, poor air removal or noncondensable gases.

   Why the other options are wrong

   • AThe test checks air removal only; it does not show that a load reached sterility.
   • CPack dryness is judged by inspecting the load after cooling, not by the Bowie-Dick test sheet.
   • DSpore kill is shown by biological indicators, not by the chemical test sheet in a Bowie-Dick pack.

4. Question 4 of 25Medium

   While loading a steam sterilizer, a technician finds a pouched device that the department's IFU records list for hydrogen peroxide sterilization. What should the technician do?

   1. AA. Load it, since steam can process anything packed for hydrogen peroxide
   2. BB. Load it after adding a steam indicator strip to the pouch
   3. CC. Take it off the cart and route it to the low-temperature method
   4. DD. Repackage it in a paper-plastic pouch for this steam load
   Show answer to question 4

   Answer: C. Take it off the cart and route it to the low-temperature method

   The department's records list the device for hydrogen peroxide, a low-temperature method, which usually means the device cannot tolerate steam. The technician removes it and routes it to the correct method instead of changing the method at the sterilizer.

   Why the other options are wrong

   • AMany items packaged for low-temperature methods are heat or moisture sensitive and would be damaged by steam.
   • BA steam indicator on the outside does not make the device or its package suitable for steam.
   • DThe method must match the device IFU; repackaging for steam at the sterilizer ignores that.

5. Question 5 of 25Medium

   When loading a steam sterilizer cart with mixed types of packages, which practice is most likely to cause wet packs from falling condensation?

   1. AA. Placing rigid sterilization containers on the lower racks of the cart
   2. BB. Arranging peel pouches on edge with paper sides facing plastic sides
   3. CC. Positioning wrapped basin sets on edge tilted slightly in the same direction
   4. DD. Placing heavy metal instrument sets on shelves directly above linen packs
   Show answer to question 5

   Answer: D. Placing heavy metal instrument sets on shelves directly above linen packs

   Placing heavy metal sets above textiles or linen packs causes condensate from the cold metal to drip down onto the absorbent materials below, creating wet packs. Correct loading requires linen packs on top shelves and metal items on lower shelves. Tilting basin sets on edge and using dedicated racks for pouches are recommended practices that promote drainage and drying.

6. Question 6 of 25Easy

   Biological indicators used to monitor steam sterilization contain spores of which microorganism?

   1. AA. Bacillus atrophaeus
   2. BB. Staphylococcus aureus
   3. CC. Mycobacterium terrae
   4. DD. Geobacillus stearothermophilus
   Show answer to question 6

   Answer: D. Geobacillus stearothermophilus

   Steam BIs contain spores of Geobacillus stearothermophilus, which are highly resistant to moist heat. The same organism is used in BIs for hydrogen peroxide sterilization.

   Why the other options are wrong

   • ABacillus atrophaeus spores are used to monitor ethylene oxide and dry heat, not steam.
   • BStaphylococcus aureus does not form spores and is far less resistant than a BI test organism.
   • CMycobacterium terrae is used in laboratory testing of disinfectant activity against mycobacteria, not to monitor sterilizers.

7. Question 7 of 25Medium

   Which combination of parameters is recorded by the physical monitoring system on a standard steam sterilizer printout?

   1. AA. Microbial spore lethality, steam purity, and vacuum efficiency
   2. BB. Relative humidity, sterilant concentration, and aeration time
   3. CC. Time, chamber temperature, and chamber pressure
   4. DD. Water hardness, electrical current, and exhaust flow rate
   Show answer to question 7

   Answer: C. Time, chamber temperature, and chamber pressure

   Physical monitoring in steam sterilization measures and records the physical conditions inside the chamber, specifically time, temperature, and pressure. Spore lethality is monitored biologically, steam purity and water hardness are utility metrics tested periodically rather than per cycle, and relative humidity and aeration apply to gas or vapor sterilization methods.

8. Question 8 of 25Medium

   A technician in sterile storage discovers an instrument set wrapped in polypropylene with intact chemical indicator tape, but the load control label has fallen off. What action should the technician take?

   1. AA. Print a replacement label with the current date and place the set back on the shelf
   2. BB. Consult the daily schedule, handwrite an estimated cycle number, and affix it
   3. CC. Send the tray to the operating room with instructions that it must be used immediately
   4. DD. Return the set to decontamination to be completely reprocessed and repackaged
   Show answer to question 8

   Answer: D. Return the set to decontamination to be completely reprocessed and repackaged

   Without a valid load control label, the package cannot be traced to a specific cycle, and its sterility cannot be documented or verified in the event of a recall. Guessing cycle numbers or slapping on a new date violates quality standards; the set must be fully reprocessed.

9. Question 9 of 25Medium

   A vaporized hydrogen peroxide (VH2O2) sterilizer has undergone major repair involving the replacement of its primary vaporizer assembly. How should qualification testing be conducted before processing clinical inventory?

   1. AA. Run three consecutive cycles using a full chamber load of absorbent cellulose materials
   2. BB. Run three consecutive cycles with a manufacturer-designated BI PCD in an empty chamber
   3. CC. Process one Bowie-Dick test pack followed by two empty chemical indicator cycles
   4. DD. Execute a single extended diagnostic cycle with an external chemical integrator
   Show answer to question 9

   Answer: B. Run three consecutive cycles with a manufacturer-designated BI PCD in an empty chamber

   Qualification testing for gaseous low-temperature sterilizers, including vaporized hydrogen peroxide systems, requires three consecutive cycles run with an appropriate BI PCD in an empty chamber with negative incubation results before release. Bowie-Dick tests are dynamic-air-removal steam tests and cannot be used in hydrogen peroxide systems. Absorbent cellulose items (such as paper or linen) abort or compromise VH2O2 cycles by absorbing the sterilant and should never be loaded into the chamber.

10. Question 10 of 25Easy

    At the end of each sterilization cycle, the operator initials the cycle printout before the load is released. What do the initials confirm?

    1. AA. The load's biological indicator test has been read as negative
    2. BB. Every package in the load was opened and checked inside
    3. CC. The operator reviewed it and found the parameters were met
    4. DD. The operator cleaned the chamber and emptied the drain strainer
    Show answer to question 10

    Answer: C. The operator reviewed it and found the parameters were met

    Initialing the printout is an accountability step. The operator checks that the cycle type, exposure time, temperature and pressure met the required values for the load, and the initials record who did that review.

    Why the other options are wrong

    • ABI results come after incubation and are recorded separately; the initials refer to the review of the printout.
    • BPackages are not opened after sterilization, since that would break the sterile barrier.
    • DSterilizer cleaning is recorded in maintenance logs and is not what the initials on a cycle printout confirm.

11. Question 11 of 25Medium

    A technician receives several items simultaneously in the prep and packaging area. Which item should receive the highest turnaround priority for assembly and sterilization?

    1. AA. A specialized ophthalmic set requested for routine maintenance inspection by the vendor
    2. BB. An emergency tracheostomy tray required to replenish an empty code response cart
    3. CC. A multi-piece robotic instrument set needed for an elective procedure later that afternoon
    4. DD. A vendor loaner set intended for a total joint replacement scheduled for tomorrow morning
    Show answer to question 11

    Answer: B. An emergency tracheostomy tray required to replenish an empty code response cart

    Life-safety and emergency items needed to restore empty rescue equipment, such as a tracheostomy set for a code cart, take precedence over scheduled elective trays. While loaner and robotic sets require timely processing to meet scheduled start times, restocking emergency equipment is the most critical operational priority.

12. Question 12 of 25Easy

    What is the main purpose of the jacket that surrounds the chamber of a steam sterilizer?

    1. AA. It holds cold water that cools the load after exposure
    2. BB. It holds the vacuum that pulls air and steam from the chamber
    3. CC. It collects condensate and air on their way to the drain
    4. DD. It holds steam that keeps the walls of the chamber heated
    Show answer to question 12

    Answer: D. It holds steam that keeps the walls of the chamber heated

    The jacket is a steam-filled space around the chamber. Keeping the chamber walls heated reduces condensation on them, which helps the load heat evenly and dry at the end of the cycle.

    Why the other options are wrong

    • ALoads cool on racks after the cycle; the jacket holds steam, not cooling water.
    • BAir is removed by the vacuum system or by gravity displacement through the drain, not by the jacket.
    • CAir and condensate leave through the chamber drain and its trap, not through the jacket.

13. Question 13 of 25Easy

    For sterilization monitoring and load release, which of these items counts as an implant?

    1. AA. Bone screws and plates that will remain in the patient
    2. BB. Drill bits and taps used to prepare the bone for screws
    3. CC. Trial sizers that are removed after fitting the joint
    4. DD. Retractors and clamps used during a bone procedure
    Show answer to question 13

    Answer: A. Bone screws and plates that will remain in the patient

    An implant is a device placed in the body and intended to stay there, such as bone screws and plates. Loads containing implants are monitored with a BI and held until its result is known, except in a documented emergency.

    Why the other options are wrong

    • BDrill bits and taps are instruments used to prepare bone and are removed during the case.
    • CTrial sizers resemble implants but are removed after fitting, so they are not implants.
    • DRetractors and clamps are surgical instruments, not devices left in the patient.

14. Question 14 of 25Medium

    While stocking supplies, a technician finds a box of unused biological indicators stored in the chemical cabinet beside sterilant cassettes and disinfectants. Why is this a problem?

    1. AA. Chemical vapors can damage the BIs and make their results unreliable
    2. BB. BIs are sterile supplies that belong with the wrapped instrument sets
    3. CC. Spores can escape from the sealed BI vials and contaminate the chemicals
    4. DD. Unused BIs must be kept in the incubator rather than a chemical cabinet
    Show answer to question 14

    Answer: A. Chemical vapors can damage the BIs and make their results unreliable

    BIs are stored as their IFU directs, away from sterilants and other chemicals, because chemical exposure can damage the spores or growth medium. A damaged BI might not grow after a real sterilization failure and would give false reassurance.

    Why the other options are wrong

    • BUnprocessed BIs contain live spores and are test devices, not sterile supplies for patient use.
    • CSelf-contained BI vials are sealed; the concern is chemicals affecting the BI, not spores escaping.
    • DThe incubator is for activated BIs under test, not for storing unused BIs.

15. Question 15 of 25Medium

    At the start of a dynamic air removal steam cycle, a technician watches the chamber pressure display drop into a vacuum and then rise as steam enters, several times in a row. What is happening?

    1. AA. The sterilizer is drying the load before the exposure begins
    2. BB. The chamber is failing to hold pressure, and the cycle will abort
    3. CC. The sterilizer is running its daily air leak test on the chamber
    4. DD. Air is being drawn out and the load heated during conditioning
    Show answer to question 15

    Answer: D. Air is being drawn out and the load heated during conditioning

    In a dynamic air removal cycle, the conditioning phase alternates vacuum pulls with steam injections. Each pulse removes more air and heats the load, so that steam can reach every surface when exposure begins.

    Why the other options are wrong

    • ADrying comes after exposure and exhaust, at the end of the cycle, not before exposure.
    • BPlanned pressure swings during conditioning are normal; a fault would trigger an alarm or an abort message.
    • CThe air leak test is a separate test cycle that holds a vacuum, not repeated pulses at the start of each load.

16. Question 16 of 25Hard

    According to ANSI/AAMI ST79, what is required when conditioning freshly laundered all-cotton surgical towels before assembling an in-house 16-towel Process Challenge Device (PCD)?

    1. AA. Hold them at room temperature and controlled humidity for at least two hours
    2. BB. Iron them flat with commercial spray sizing to remove residual lint
    3. CC. Autoclave them once without packaging to preshrink the cotton fibers
    4. DD. Moisten them with sterile distilled water until they reach a uniform weight
    Show answer to question 16

    Answer: A. Hold them at room temperature and controlled humidity for at least two hours

    ANSI/AAMI ST79 specifies that towels for an in-house steam PCD must be freshly laundered, unironed, and held at room temperature (65 to 75 degrees Fahrenheit) and 30 to 60 percent relative humidity for at least two hours prior to assembly to prevent superheating caused by overly dry fibers. Ironing or wetting towels alters pack density and sterilant absorption, invalidating the standardized resistance profile.

17. Question 17 of 25Hard

    After a steam sterilizer undergoes major mechanical repair following a cycle failure, which qualification testing protocol is required before returning the unit to routine service?

    1. AA. One empty cycle containing a single chemical indicator placed directly over the drain
    2. BB. Two consecutive cycles containing maximum production loads with chemical indicators
    3. CC. Three consecutive empty cycles with a biological indicator process challenge device
    4. DD. Five consecutive cycles containing routine instrumentation loads with biological indicators
    Show answer to question 17

    Answer: C. Three consecutive empty cycles with a biological indicator process challenge device

    ANSI/AAMI ST79 requires qualification testing consisting of three consecutive empty-chamber cycles run with a biological indicator process challenge device (and a Bowie-Dick test for dynamic air removal sterilizers) following major repairs before the unit is returned to service. Running full production loads or single chemical indicator cycles does not meet the standard for qualification testing and risks releasing unvalidated loads.

18. Question 18 of 25Easy

    Under AAMI guidance, how often should a steam sterilizer be routinely monitored with a biological indicator process challenge device?

    1. AA. At least monthly, and preferably once every week
    2. BB. Once a year, during preventive maintenance
    3. CC. At least weekly, and preferably each day of use
    4. DD. Whenever the daily Bowie-Dick type test has failed
    Show answer to question 18

    Answer: C. At least weekly, and preferably each day of use

    AAMI guidance calls for routine BI PCD monitoring of steam sterilizers at least weekly, and preferably every day the sterilizer is used, plus every load that contains an implant. More frequent testing finds a failure sooner and limits the loads that must be recalled.

    Why the other options are wrong

    • AMonthly testing falls short of the weekly minimum and leaves many loads unmonitored between results.
    • BAnnual testing is far below the routine minimum, and preventive maintenance is a separate activity.
    • DA failed Bowie-Dick test takes the sterilizer out of use; it is not the trigger for routine BI monitoring.

19. Question 19 of 25Medium

    While moving packages onto the steam sterilizer cart, a technician finds a wrapped tray whose flaps were taped down with plain masking tape instead of indicator tape. No other indicator is visible on the outside of the package. What should the technician do?

    1. AA. Return it to be closed with indicator tape before it is sterilized
    2. BB. Load it, since the internal indicator in the tray will show the result
    3. CC. Load it, then put indicator tape on the wrap after the cycle
    4. DD. Send it back to decontamination so the tray is cleaned again
    Show answer to question 19

    Answer: A. Return it to be closed with indicator tape before it is sterilized

    A wrapped package needs a closure made for sterilization and an external indicator that can be checked without opening it. Masking tape provides neither, so the tray goes back to be closed with indicator tape before it is loaded.

    Why the other options are wrong

    • BThe internal indicator cannot be seen until the tray is opened, so it cannot do the job of an external indicator.
    • CTape added after the cycle has not been through it, so its color would show nothing about this tray.
    • DThe tray was cleaned and assembled; only its closure and external indicator need correcting, so recleaning is not needed.

20. Question 20 of 25Medium

    An instrument will be processed by IUSS in a sterilizer in the SP department and must then be carried down the corridor to an operating room. Which method keeps it sterile on the way?

    1. AA. In an open tray, carried quickly by the shortest route to the room
    2. BB. In an open IUSS tray covered with a clean towel from the linen cart
    3. CC. In a closed container designed for IUSS, taken straight to the room
    4. DD. Wrapped in a sterile towel after the cycle, then carried by hand
    Show answer to question 20

    Answer: C. In a closed container designed for IUSS, taken straight to the room

    IUSS items must reach the point of use without contamination, so a closed rigid container designed and validated for IUSS is used and taken directly to the room. An open tray exposes the item to the environment as soon as the sterilizer door opens.

    Why the other options are wrong

    • ASpeed does not protect an unwrapped, wet item from airborne and contact contamination in the corridor.
    • BA clean towel is not a sterile barrier, so the item can be contaminated during transport.
    • DWrapping a hot, wet item by hand after the cycle can contaminate it, and a towel is not a validated barrier.

21. Question 21 of 25Hard

    After removing warm wrapped packages from a steam sterilizer cart, a technician places them directly onto a cold, solid stainless steel table. What is the primary risk of this action?

    1. AA. The packages will develop condensation due to rapid conductive heat loss
    2. BB. The internal biological indicator will produce a false-negative culture result
    3. CC. The stainless steel surface will transfer residual processing oils into the instruments
    4. DD. The physical barrier properties of the nonwoven wrap will permanently shrink
    Show answer to question 21

    Answer: A. The packages will develop condensation due to rapid conductive heat loss

    Placing warm items onto cold, solid surfaces causes rapid conductive heat transfer, leading to moisture condensation inside or underneath the packages, resulting in wet packs. Cool-down must occur on the cart or on insulated, padded, or wire surfaces in a low-traffic area until room temperature is reached. Nonwoven wrap does not permanently shrink from temperature transfer, making that distractor incorrect.

22. Question 22 of 25Hard

    After the daily Bowie-Dick type test, the test sheet shows an even dark color around the edges but a lighter area in the center. What does this mean, and what should the technician do?

    1. AA. It passed, because most of the sheet changed to the dark color
    2. BB. It failed; take the sterilizer out of use and report the result
    3. CC. It is acceptable if the first load also contains a biological indicator
    4. DD. It is unclear; report it, run the first load and repeat the test later
    Show answer to question 22

    Answer: B. It failed; take the sterilizer out of use and report the result

    A pass requires a uniform color change across the whole sheet. A lighter area, usually in the center, means air remained in the pack, so the sterilizer is not used for loads and the failure is reported for evaluation and retesting.

    Why the other options are wrong

    • AAny nonuniform area shows trapped air; a partial color change is a failed test.
    • CA biological indicator in a later load does not correct or explain an air removal failure.
    • DA nonuniform result is a failure, and running loads first would expose patient items to an air removal problem.

23. Question 23 of 25Hard

    An emergency request is made to release an orthopedic implant set before biological indicator incubation is complete. Upon opening the process challenge device, the technician observes that the Class 5 integrating indicator did not reach the accept window. What action must be taken?

    1. AA. Refuse to release the implant and quarantine all items from that sterilization load
    2. BB. Complete the early release form and dispense the tray to prevent surgery delays
    3. CC. Dispense the tray if the physical printout verifies that exposure parameters were met
    4. DD. Re-run a second process challenge device in an immediate cycle to confirm results
    Show answer to question 23

    Answer: A. Refuse to release the implant and quarantine all items from that sterilization load

    Emergency early release of an implant is acceptable only if the Class 5 chemical integrating indicator inside the process challenge device demonstrates a passing result. If the Class 5 indicator fails, the load cannot be released under any circumstances, and all items in that cycle must be quarantined. Relying on physical monitors when a chemical integrator fails violates basic sterilization assurance standards.

24. Question 24 of 25Hard

    The department runs its routine steam sterilizer BI test weekly, and Monday's result was negative. On Wednesday, a technician is about to run a tray of orthopedic implant screws in that sterilizer, and a coworker says Monday's test covers the whole week. What is the best response?

    1. AA. Agree, since an implant load needs its own BI only when the routine test has failed
    2. BB. Add a BI PCD to this load, as every load with an implant needs one
    3. CC. Use an integrating indicator alone in the tray in place of a BI PCD
    4. DD. Run the load as usual and repeat the routine test next Monday
    Show answer to question 24

    Answer: B. Add a BI PCD to this load, as every load with an implant needs one

    Every load containing an implant is monitored with a BI PCD, usually one that also holds a Type 5 integrating indicator, and implants are quarantined until the BI result is known except in a documented emergency. Routine weekly testing does not replace this.

    Why the other options are wrong

    • AImplant loads need a BI PCD every time, whatever the result of the routine test.
    • CAn integrating indicator does not replace the BI PCD required in every implant load.
    • DWaiting for next week's routine test leaves this implant load without the monitoring it requires.

25. Question 25 of 25Hard

    What is the primary risk of running a Bowie-Dick test cycle for longer than the manufacturer's validated exposure time?

    1. AA. The chamber drain line will overheat and prevent steam condensation from discharging
    2. BB. The chemical indicator will revert back to its unreacted color, causing a false failure
    3. CC. The paper fibers of the test pack will ignite due to prolonged exposure to dry heat
    4. DD. The indicator sheet may show a uniform color change despite trapped air, causing a false pass
    Show answer to question 25

    Answer: D. The indicator sheet may show a uniform color change despite trapped air, causing a false pass

    If a Bowie-Dick test is exposed for too long (such as running a 3.5-minute test pack on a 5-minute cycle), heat and moisture can eventually penetrate into trapped air pockets and turn the indicator uniformly dark, producing a dangerous false-pass reading. Chemical indicators in steam sterilization do not revert to their unreacted state once turned, and steam sterilizer conditions do not support paper combustion.

Email me my score report

The full CRCST bank has 551 Sterilization Process questions. See plans