Which statement describes the aeration requirement for Ethylene Oxide (ETO) sterilization?

• A. No aeration is required after the cycle.
• B. Items can be released immediately after the cycle.
• C. Aeration is required to remove toxic gas; risk of chemical exposure if not aerated.
• D. Aeration is optional and only for fast-track processing.

Answer: (C)

Ethylene oxide sterilization uses a toxic gas, so finishing the cycle isn’t enough to make instruments safe to handle. The aeration phase is essential because it drives off residual EO and byproducts from the items and the chamber, lowering the gas concentration to safe levels for staff. If you skip aeration or try to release items immediately, workers could be exposed to harmful fumes, which can cause irritation and more serious health effects. Because of these safety risks, aeration is not optional and is a mandated part of the process to protect people and make the sterilized items safe to use.