Medical Device Reprocessing Association of Ontario (MDRAO) Practice Exam

What is a unique feature of peracetic acid sterilization?

1. It requires a vacuum environment

2. It utilizes a low temperature process

3. Devices must be immersed in liquid sterilant

4. It has a long exposure time

The correct answer is: Devices must be immersed in liquid sterilant

Peracetic acid sterilization is characterized by its ability to effectively sterilize without the need for high temperatures, making it unique among various sterilization methods. One defining feature is that peracetic acid is typically used in a liquid form, and devices must indeed be immersed in this liquid sterilant for effective microbial kill. This immersion is crucial as it ensures that all surfaces of the medical devices come in contact with the sterilant, allowing the active components of peracetic acid to penetrate and act on all surfaces, including complex geometries and lumens. Unlike other methods that might rely on vapor or gas, this liquid-phase sterilization creates a uniform environment where the agent can exert its antimicrobial properties. The other provided options do not align with the characteristics of peracetic acid sterilization. While a vacuum environment can enhance the efficacy of some sterilization methods, it is not a unique feature of peracetic acid sterilization. Similarly, the process is indeed low temperature, but the immersion aspect is what distinctly sets it apart from others that might employ different mediums. Lastly, peracetic acid typically has a shorter exposure time compared to many traditional sterilization methods, further reinforcing that immersion is the primary means of achieving sterilization.