Free CRCST practice test

15 questions · all 7 content domains · about 15 minutes. Pick an answer to see whether you’re right and why.

1. Question 1 of 15 · Departmental considerationsIn the chain of infection, which link is described as the method by which the agent moves from the reservoir to a new host, such as contact, droplet, or airborne spread?

   A.Portal of exitB.Susceptible hostC.Mode of transmissionD.Portal of entry
   Show answer

   Answer: C. Mode of transmission

   Mode of transmission is how the agent travels from the reservoir to a new host: contact, droplet, airborne, vehicle or vector. Breaking this link (hand hygiene, PPE, closed transport) is a core goal of every decontamination practice.

2. Question 2 of 15 · Departmental considerationsAn instrument described as a small double-ended handheld retractor with a blade on each end is most likely which of the following?

   A.Army-Navy retractorB.Senn retractorC.Balfour retractorD.Gelpi retractor
   Show answer

   Answer: A. Army-Navy retractor

   The Army-Navy retractor is a small, double-ended hand-held retractor with a blade at each end. Senn retractors are also double-ended but have a rake at one end; Balfour and Gelpi retractors are self-retaining.

3. Question 3 of 15 · Cleaning, decontamination & disinfectionWhich agent is classified as a cleaning agent (not a disinfectant) and is used to break down protein, fat, and other organic soil prior to disinfection or sterilization?

   A.Steam under pressureB.IodophorsC.Chlorine dioxideD.Enzymatic detergent
   Show answer

   Answer: D. Enzymatic detergent

   Enzymatic detergents are cleaning agents: their enzymes break down protein, fat and other organic soil so it can be rinsed away. They do not disinfect, so cleaning must still be followed by disinfection or sterilization.

4. Question 4 of 15 · Cleaning, decontamination & disinfectionUtility (tap) water is best suited for which use in sterile processing?

   A.The final rinse of critical devices or steam sterilizer boiler feedwater where mineral deposits must be minimizedB.The initial gross rinse of instrumentsC.Final rinse steps to reduce spotting and mineral residue on instrumentsD.Wash cycles where mineral scale buildup on equipment must be reduced
   Show answer

   Answer: B. The initial gross rinse of instruments

   Utility (tap) water is acceptable for the initial rinse and washing steps. Critical water (treated, such as reverse osmosis or deionized) is used for the final rinse so minerals and contaminants are not left on devices.

5. Question 5 of 15 · Cleaning, decontamination & disinfectionWhat is Ortho-phthalaldehyde (OPA) typically used for in the sterile processing department?

   A.Used similarly to isopropyl alcohol for rapid surface disinfectionB.Used as the sterilant in gravity-displacement and pre-vacuum steam sterilizersC.Used as an alternative to glutaraldehyde for heat-sensitive semicritical devicesD.Used as a skin antiseptic for patient skin preparation, not for reprocessing devices
   Show answer

   Answer: C. Used as an alternative to glutaraldehyde for heat-sensitive semicritical devices

   Ortho-phthalaldehyde (OPA) is a high-level disinfectant used as an alternative to glutaraldehyde for heat-sensitive semicritical devices such as some endoscopes. It is not a skin antiseptic or a steam sterilant.

6. Question 6 of 15 · Preparation & packagingWhy should an instrument set not exceed the size and configuration validated by the sterilizer and container manufacturers?

   A.Sterilization efficacy is validated for a specific tray density and configuration; deviations can prevent adequate sterilant penetrationB.A container validated for steam may not be validated for EO or hydrogen peroxide plasma, since sterilant penetration paths differC.A damaged or improperly seated filter or valve compromises the container's ability to allow sterilant in while excluding contaminants afterwardD.Placing heavier items on the bottom protects lighter, more delicate instruments from being crushed
   Show answer

   Answer: A. Sterilization efficacy is validated for a specific tray density and configuration; deviations can prevent adequate sterilant penetration

   Sterilization efficacy is validated for a specific tray weight, density and configuration. A heavier or differently configured set may not let the sterilant reach every surface, and it can also cause wet packs.

7. Question 7 of 15 · Preparation & packagingWhy must a rigid container's gasket be inspected for cracks, tears or flattening before each use?

   A.A fabric that is too thin or worn will not provide an adequate microbial barrier even though it may look intactB.Standardization ensures consistency across shifts and staff, reducing the chance of missing or incorrect instrumentsC.Missing instruments could indicate a retained surgical item, a serious patient safety eventD.A compromised gasket cannot form the airtight seal that keeps the sterile barrier intact after processing
   Show answer

   Answer: D. A compromised gasket cannot form the airtight seal that keeps the sterile barrier intact after processing

   The gasket forms the seal between lid and container. If it is cracked or flattened, the container cannot keep its sterile barrier intact after processing.

8. Question 8 of 15 · Preparation & packagingWhich element of a package label identifies the set or item inside without opening the package?

   A.Preparer's initialsB.Contents descriptionC.Load or cycle numberD.Expiration or event-related notation
   Show answer

   Answer: B. Contents description

   The contents description names what is in the package. Preparer initials, load or cycle number, and the expiration or event-related statement serve accountability and lot control, not identification of the contents.

9. Question 9 of 15 · Sterilization processWhy is residual air trapped in a steam sterilizer chamber one of the most common causes of sterilization failure?

   A.A clogged drain strainer can impede proper air and condensate removal, leading to cycle failures or wet packsB.Consistent, defined testing schedules ensure ongoing verification that the sterilizer continues to perform reliably over timeC.Trapped air acts as an insulator that prevents steam or gas from directly contacting and penetrating all package surfacesD.The process breaks down into water vapor and oxygen, leaving no toxic residue
   Show answer

   Answer: C. Trapped air acts as an insulator that prevents steam or gas from directly contacting and penetrating all package surfaces

   Air acts as an insulator: where it is trapped, steam cannot directly contact the surfaces of the package and its contents. That is why air removal is tested daily in dynamic-air-removal sterilizers with a Bowie-Dick type test.

10. Question 10 of 15 · Sterilization processWhy should packages not touch the walls of the sterilizer chamber?

    A.Contact with the cool chamber wall can cause condensation and result in a wet, contaminated packageB.Trapped water can prevent complete drying and cause a wet pack, which is considered contaminatedC.This orientation allows air and condensation to drain and steam or gas to circulate around the packageD.Crowding blocks sterilant circulation and prevents even contact with every package surface
    Show answer

    Answer: A. Contact with the cool chamber wall can cause condensation and result in a wet, contaminated package

    The chamber wall can be cooler than the steam, so a package touching it can collect condensate and come out as a wet pack, which must be considered contaminated.

11. Question 11 of 15 · Sterilization processAn ethylene oxide (EO) load is released for use before its aeration period is complete. What does this represent?

    A.Inadequate sterilant penetration to the interior of that specific package despite apparent overall cycle successB.Poor water quality, such as using utility water where purified water was required for the final rinse or steam supplyC.Incompatible cleaning chemicals, poor water quality, or damage from repeated processing beyond the instrument's expected service lifeD.A serious safety failure, since toxic EO residue remaining in the materials can cause tissue injury to a patient or user
    Show answer

    Answer: D. A serious safety failure, since toxic EO residue remaining in the materials can cause tissue injury to a patient or user

    EO is toxic, and residues remain in materials until aeration removes them. Releasing items early is a serious safety failure: the residue can injure the patient or the person handling the item.

12. Question 12 of 15 · Sterile storage, transport & inventoryWhich inventory practice tracks items by their sterilization load and date so they can be traced or recalled?

    A.Point-of-use inventory systemB.Lot controlC.Par levelD.Consignment inventory
    Show answer

    Answer: B. Lot control

    Lot control (load) numbers link each package to a specific sterilizer, cycle and date. If a biological indicator later fails, the department can recall exactly the affected items.

13. Question 13 of 15 · Sterile storage, transport & inventoryWhy should sterile packages be handled as little as possible while in storage?

    A.Par levels help balance having adequate supply against overstocking and unnecessary storage burdenB.This level of detail supports patient notification and follow-up if a sterilization or cleaning failure is discovered after the factC.Excess handling increases the risk of tears, punctures, or seal damage that could compromise the sterile barrierD.Adequate air filtration and exchange reduce airborne particulate and microbial load that could settle on stored packages
    Show answer

    Answer: C. Excess handling increases the risk of tears, punctures, or seal damage that could compromise the sterile barrier

    Sterility is event-related: every time a package is handled, there is a chance of tears, punctures or seal damage that compromise the sterile barrier.

14. Question 14 of 15 · Patient care equipment & distributionAn ultrasound probe was covered with a single-use sheath during an exam. Why does it still need reprocessing according to its Spaulding classification?

    A.The sheath is a supplemental barrier, not a replacement for validated reprocessing of the reusable probe underneathB.Residual moisture supports microbial growth and biofilm formation, so active drying reduces the risk of recontaminationC.These items only contact intact skin, which carries the lowest risk of transmitting infectionD.This system relies on ordering or automatic triggers rather than a scheduled cart exchange
    Show answer

    Answer: A. The sheath is a supplemental barrier, not a replacement for validated reprocessing of the reusable probe underneath

    A sheath is a supplemental barrier, not a substitute for reprocessing. Sheaths can have small perforations, so the probe underneath is reprocessed according to what it contacts.

15. Question 15 of 15 · Professional development & human relationsWhy does the OSHA Bloodborne Pathogens Standard apply to sterile processing technicians?

    A.Continuing to use malfunctioning equipment risks processing failures that could compromise patient safetyB.Personal hygiene and appropriate attire reduce the risk of introducing contamination into clean or sterile work areasC.Sterile processing involves frequently lifting and moving heavy trays and equipment, creating musculoskeletal injury riskD.Sterile processing technicians routinely handle contaminated instruments, placing them at risk of bloodborne pathogen exposure
    Show answer

    Answer: D. Sterile processing technicians routinely handle contaminated instruments, placing them at risk of bloodborne pathogen exposure

    Technicians routinely handle contaminated instruments in decontamination, which puts them at risk of exposure to blood and body fluids. The standard requires employers to protect them with PPE, engineering controls, training and hepatitis B vaccination.