CRCST Practice Exam

The final phase of Ethylene oxide sterilization cycle is:

1. Prevacuum

2. Aeration

3. OSHA

4. Retractors

The correct answer is: Aeration

The final phase of the Ethylene oxide sterilization cycle is aeration. This stage is crucial because it involves the removal of residual ethylene oxide gas from the sterilized items. Ethylene oxide is a potent gas that is effective in sterilizing heat-sensitive medical instruments and devices, but it can also be toxic if left on these items after the sterilization process. During aeration, items are typically placed in a controlled environment (which can be a chamber or room) where the conditions are optimized to facilitate the dissipation of the gas. This process not only ensures safety for the end-users of the sterilized products but also helps to meet regulatory standards for residual gas levels. In contrast, the prevacuum phase is a preparatory step in the sterilization cycle that helps to remove air from the chamber before the exposure phase, while OSHA refers to the Occupational Safety and Health Administration, which is concerned with workplace safety standards, not the sterilization cycle itself. Retractors are surgical instruments used to hold back tissues but are not directly related to the sterilization process.