Certification Board for Sterile Processing and Distribution (CBSPD) Sterile Processing Technician Practice Exam

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During which stage of gas sterilization is the chamber evacuated?

  1. Exposure

  2. Evacuation

  3. Temperature Holding

  4. Cooling

The correct answer is: Evacuation

The stage of gas sterilization during which the chamber is evacuated is the evacuation phase. This process involves removing air from the chamber to create a vacuum. The purpose of this vacuum is to ensure that there are no air pockets that could interfere with the penetration of the sterilizing gas, such as ethylene oxide. During evacuation, the presence of air would prevent the gas from effectively contacting and sterilizing the items inside. Achieving a complete vacuum is crucial, as it prepares the environment for optimal gas distribution and absorption, which are vital for effective sterilization. Once the evacuation is complete, the exposure phase follows, where the sterilizing gas is introduced. This method ensures that the items receive the intended level of sterilization without obstructions that could arise from leftover air. The other stages, such as exposure, temperature holding, and cooling, take place subsequently and do not involve the removal of air from the chamber.