CRCST Instruments Practice Questions (2026): 15 Free Questions with Answers

15 Free CRCST Instruments Questions, Answered and Explained

Work through all 15 questions below. Every answer includes an explanation that cites its source. When you finish, head back to the full 50-question practice test.

1. Surgical Instruments

   Question 1: Instrument lubricant, often called instrument milk, is applied:

   • A) Before cleaning, to loosen soil
   • B) After cleaning and before sterilization, to protect hinges, box locks, and moving parts
   • C) After sterilization, just before the case
   • D) Only to powered instruments
   Answer and explanation

   Correct answer: B

   Lubricant keeps box locks and joints moving freely through the heat of sterilization. It goes on after cleaning so it is not washed away, must be steam-penetrable and water-soluble, and mineral oil is never used because steam cannot pass through it. (Source: AAMI ST79)

2. Surgical Instruments

   Question 2: Tungsten carbide inserts on needle holders and scissors are identified by:

   • A) Blue handles
   • B) Gold-colored handles
   • C) A red dot on the box lock
   • D) Extra-long shanks
   Answer and explanation

   Correct answer: B

   Tungsten carbide jaw inserts stay sharper far longer than plain stainless. Manufacturers mark these instruments with gold-colored handles or gold-plated finger rings so they are easy to spot at the tray. (Source: HSPA CRCST exam content outline)

3. Surgical Instruments

   Question 3: When testing a needle holder, the technician verifies that the ratchet:

   • A) Locks securely on the first tooth and the jaws meet evenly
   • B) Only locks on the last tooth
   • C) Springs open on its own
   • D) Makes a clicking sound, which is all that matters
   Answer and explanation

   Correct answer: A

   A needle holder must grip suture needles firmly without crushing them. Locking on the first tooth with jaws meeting evenly proves the ratchet and alignment are sound; slipping or misalignment sends the instrument to repair. (Source: HSPA CRCST exam content outline)

4. Surgical Instruments

   Question 4: Surface stains on stainless steel instruments should be removed with:

   • A) Steel wool for stubborn spots
   • B) A non-abrasive, instrument-grade stain remover, used per its IFU
   • C) Bleach, which brightens the metal
   • D) A wire brush
   Answer and explanation

   Correct answer: B

   Abrasives scratch the passive layer and create crevices where soil and corrosion start. Instrument-grade stain removers lift discoloration chemically without damaging the surface, and the cause of the staining should be investigated. (Source: HSPA CRCST exam content outline)

5. Surgical Instruments

   Question 5: Instrument marking tape that is peeling, cracked, or gummy must be:

   • A) Left in place until the next repair cycle
   • B) Covered with a second layer of tape
   • C) Removed completely and replaced, because damaged tape harbors bioburden
   • D) Trimmed with scissors and reused
   Answer and explanation

   Correct answer: C

   Damaged tape lifts at the edges, trapping blood and tissue where cleaning cannot reach. Tape is an aid to identification, not a permanent fixture: when it fails, it comes off entirely and is replaced with fresh tape applied per the tape IFU. (Source: AAMI ST79)

6. Surgical Instruments

   Question 6: Laparoscopic and electrosurgical instruments with insulation must be:

   • A) Used until the insulation visibly falls off
   • B) Tested for insulation defects with an insulation tester before use
   • C) Soaked in saline to condition the insulation
   • D) Never inspected, since insulation never fails
   Answer and explanation

   Correct answer: B

   A pinhole in insulation lets electrosurgical current escape and burn tissue outside the surgeon view. Insulation testing before use finds invisible defects, and any instrument that fails is removed from service for repair. (Source: HSPA CRCST exam content outline)

7. Surgical Instruments

   Question 7: Powered surgical instruments, such as drills and saws, must be cleaned:

   • A) By full immersion in detergent, like hand instruments
   • B) According to the manufacturer IFU, and never immersed unless the IFU specifically allows it
   • C) Only with compressed air
   • D) In the ultrasonic cleaner with other trays
   Answer and explanation

   Correct answer: B

   Motors, batteries, and seals inside powered instruments are damaged by immersion and by some cleaning chemistries. The IFU defines exactly how each device is cleaned, lubricated, and sterilized, and deviating from it voids safety and warranty. (Source: AAMI ST79)

8. Surgical Instruments

   Question 8: Robotic instrument arms with a limited number of uses must be:

   • A) Used until they break, then discarded
   • B) Tracked by use count and removed from service when the manufacturer-stated life is reached
   • C) Resterilized indefinitely, since sterilization renews them
   • D) Counted only once a year
   Answer and explanation

   Correct answer: B

   Robotic instruments are validated for a set number of uses, after which cables stretch and wrists loosen beyond safe tolerances. Tracking each use and retiring the instrument on schedule prevents in-procedure failure. (Source: HSPA CRCST exam content outline)

9. Surgical Instruments

   Question 9: On an instrument stringer, hinged instruments are positioned:

   • A) Fully closed and locked, to keep sets compact
   • B) Open and unlocked, so steam reaches into the box lock
   • C) With tape holding the jaws shut
   • D) Upside down, to drain better
   Answer and explanation

   Correct answer: B

   A closed box lock seals off its own crevices from steam. Stringing hinged instruments open exposes the entire hinge to cleaning and sterilant, which is the whole point of the stringer. (Source: AAMI ST79)

10. Surgical Instruments

    Question 10: A tray count does not match the count sheet. The technician must:

    • A) Release the tray and let the OR sort it out
    • B) Add a similar-looking instrument from another tray
    • C) Search decontamination, assembly, and the sterilizer area, document the discrepancy, and not release the tray until it is resolved
    • D) Change the count sheet to match the tray
    Answer and explanation

    Correct answer: C

    A missing instrument may be in another tray, in the washer, or, worst case, unaccounted for near a patient. The tray stays quarantined while every area is searched, and the discrepancy is documented per facility policy. (Source: HSPA CRCST exam content outline)

11. Surgical Instruments

    Question 11: Cutting instruments such as scissors and osteotomes are typically made from:

    • A) 300-series stainless steel, which never holds an edge
    • B) 400-series stainless steel, which can be hardened to hold a sharp edge
    • C) Pure aluminum
    • D) Plastic composites
    Answer and explanation

    Correct answer: B

    400-series stainless is martensitic and can be heat-treated to hold a keen cutting edge, which is why scissors, knives, and chisels use it. 300-series austenitic stainless resists corrosion well but cannot hold an edge the same way. (Source: HSPA CRCST exam content outline)

12. Surgical Instruments

    Question 12: The corrosion resistance of stainless steel instruments comes from:

    • A) A coating of mineral oil applied at the factory
    • B) A thin chromium-oxide passive layer on the surface
    • C) The nickel content alone
    • D) Regular exposure to bleach
    Answer and explanation

    Correct answer: B

    Chromium in the steel reacts with oxygen to form an invisible chromium-oxide film that seals the metal from corrosion. Anything that damages this passive layer, such as chlorides, abrasives, or harsh chemicals, invites rust and pitting. (Source: HSPA CRCST exam content outline)

13. Surgical Instruments

    Question 13: Within an instrument tray, the heaviest instruments are placed:

    • A) On top, so they are easy to grab
    • B) On the bottom, to protect delicate instruments and help condensate drain
    • C) In a separate peel pouch inside the tray
    • D) It does not matter where they go
    Answer and explanation

    Correct answer: B

    Heavy retractors and mallets crush fine tips and jaws when stacked on top, and weight concentrated at the bottom keeps the tray balanced for safe handling. Bottom placement also lets condensate drain away from the load instead of pooling on delicate surfaces. (Source: AAMI ST79)

14. Surgical Instruments

    Question 14: A Kerrison rongeur comes back with a bent tip. The technician should:

    • A) Bend it back with pliers and return it to the tray
    • B) Remove it from service, tag it, and send it for repair
    • C) File the tip smooth and keep using it
    • D) Hide it at the bottom of the tray
    Answer and explanation

    Correct answer: B

    A bent tip will not cut cleanly and may break off in the surgical site. Straightening it at the tray weakens the metal further; only qualified repair can restore it, so the instrument is tagged and pulled from service. (Source: HSPA CRCST exam content outline)

15. Surgical Instruments

    Question 15: Detachable blades and inserts on instruments such as retractors and rongeurs must be:

    • A) Left attached permanently to avoid losing parts
    • B) Removed during cleaning and inspection so all surfaces can be processed, then reassembled per the IFU
    • C) Discarded after each use
    • D) Glued in place before sterilization
    Answer and explanation

    Correct answer: B

    Mating surfaces between blades and handles trap soil that neither brushes nor sterilant can reach while assembled. Disassembling per the IFU exposes every surface, and reassembly follows the same IFU so the instrument goes back together correctly. (Source: AAMI ST79)

Back to the full 50-question free CRCST practice test

Sources

Every explanation on this page cites one of the references below. Always follow your facility's policies and the manufacturer instructions for use.

• AAMI ST79, Comprehensive guide to steam sterilization and sterility assurance in health care facilities. Association for the Advancement of Medical Instrumentation.
• OSHA 29 CFR 1910.1030, Bloodborne Pathogens standard. U.S. Occupational Safety and Health Administration.
• CDC Guideline for Disinfection and Sterilization in Healthcare Facilities (2008, updated 2019). Centers for Disease Control and Prevention.
• HSPA CRCST Exam Content Outline. Healthcare Sterile Processing Association.

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