NHA Certified Clinical Medical Assistant (CCMA)Clinical Patient CareHard
A medical assistant is preparing to assist with a minor surgical procedure. Which of the following is the most effective method for sterilizing heat-sensitive instruments?
- ABoiling water
- BDry heat sterilization
- CEthylene oxide gas
- DAutoclave
Show answer & explanationAnswer & explanation
Correct answer: C. Ethylene oxide gas
Ethylene oxide gas sterilization is a low-temperature process that is highly effective for heat-sensitive instruments, as it sterilizes without causing damage from high heat or moisture.
Why the other options are wrong
- A. Boiling water is a disinfection method, not sterilization, and would not destroy all microorganisms, including spores, nor is it suitable for heat-sensitive items in terms of sterility.
- B. Dry heat sterilization uses very high temperatures for prolonged periods, making it unsuitable for heat-sensitive items.
- D. Autoclaves use high-temperature steam, which would damage heat-sensitive instruments.
Sterilization Methods for Heat-Sensitive Items
Heat-sensitive instruments require low-temperature sterilization methods, such as ethylene oxide gas or chemical solutions, to prevent damage while achieving sterility.
- Ethylene oxide (EtO) gas is common.
- Hydrogen peroxide plasma/vapor also used.
- Glutaraldehyde (high-level disinfection, not true sterilization).
- Avoids heat and moisture damage.
Memory trick: Heat-Sensitive: EtO's the Go!