CRCST Instrument Processing 3 — Questions and Answers
Question 1: A chemical indicator (CI) placed inside a wrapped instrument set serves what primary function?
- Confirms the package was exposed to sterilization conditions (Correct answer)
- Guarantees the instruments inside are sterile
- Measures the total microbial load on the instruments
- Verifies the wrap is free from holes or tears
Correct answer: Confirms the package was exposed to sterilization conditions
Internal CIs confirm that sterilization conditions (such as steam, temperature, and time) penetrated the packaging and reached the instruments inside.
Question 2: The Bowie-Dick test is used to detect:
- Failure of biological indicators to kill resistant spores
- Air removal and steam penetration issues in pre-vacuum sterilizers (Correct answer)
- Chemical concentration levels in EO sterilization cycles
- Residual moisture content in steam-sterilized packs
Correct answer: Air removal and steam penetration issues in pre-vacuum sterilizers
The Bowie-Dick test verifies that the pre-vacuum sterilizer is effectively removing air and allowing steam to penetrate the load uniformly.
Question 3: Point-of-use treatment of contaminated instruments before transport to the decontamination area should include:
- Full sterilization in the OR using a flash sterilizer
- Removing gross soil and keeping instruments moist to prevent drying (Correct answer)
- Soaking in a high-level disinfectant for 10 minutes
- Wrapping instruments in sterile drapes until processed
Correct answer: Removing gross soil and keeping instruments moist to prevent drying
Removing gross soil and keeping instruments moist prevents bioburden from drying and hardening, which makes subsequent cleaning much more difficult.
Question 4: Which personal protective equipment (PPE) is required when working in the decontamination area?
- Sterile gloves and a surgical mask only
- Utility gloves, face shield, fluid-resistant gown, and shoe covers (Correct answer)
- Examination gloves and safety glasses only
- Sterile gloves, N95 respirator, and sterile gown
Correct answer: Utility gloves, face shield, fluid-resistant gown, and shoe covers
The decontamination area requires full barrier PPE including utility gloves, face shield, fluid-resistant gown, and shoe covers to protect against blood and body fluid exposure.
Question 5: What does the term 'bioburden' refer to in instrument processing?
- The weight of instruments in a sterilization tray
- The number and type of viable microorganisms on an unsterilized item (Correct answer)
- The chemical load of detergent residue on instruments after washing
- The thermal resistance of spores used in biological indicators
Correct answer: The number and type of viable microorganisms on an unsterilized item
Bioburden refers to the population of viable microorganisms present on an item before sterilization, which must be minimized through effective cleaning.
Question 6: Stainless steel instruments with pitting corrosion are most likely damaged by:
- Exposure to steam at high temperatures
- Contact with saline or chloride-containing solutions (Correct answer)
- Improper lubrication with instrument milk
- Ultrasonic cleaning at incorrect frequencies
Correct answer: Contact with saline or chloride-containing solutions
Chloride ions in saline solutions attack the passive oxide layer of stainless steel, causing pitting corrosion over time.
Question 7: When preparing a peel pouch for sterilization, the paper-to-paper or plastic-to-plastic sealing method is avoided because:
- It reduces the sterilant penetration into the package
- It does not allow for proper peel-open technique without contamination (Correct answer)
- It causes the pouch to burst during the sterilization cycle
- It does not meet labeling requirements for sterile packaging
Correct answer: It does not allow for proper peel-open technique without contamination
Paper-to-paper or plastic-to-plastic orientation prevents the proper peel-apart opening technique, risking contamination of the sterile contents during aseptic presentation.
CRCST Instrument Processing 3
A chemical indicator (CI) placed inside a wrapped instrument set serves what primary function?