MDRAO Practice Exam 2025 – Complete Exam Prep Resource

In a pre-vacuum steam sterilizer, sterilization begins when steam completely fills the chamber. This is crucial because effective sterilization relies on the ability of steam to penetrate all items and surfaces within the chamber. Complete steam penetration ensures that all air pockets are eliminated, which is essential for achieving the necessary temperature and moisture levels for effective microbial destruction.

Once the steam fills the chamber, it creates the ideal environment for the sterilization process, utilizing both heat and moisture. Inadequate steam filling can lead to incomplete sterilization, as areas may remain cooler and unable to effectively kill pathogens. Thus, the fundamental condition for initiating the sterilization process is the complete filling of the chamber with steam. This point marks the transition where the conditions required for sterilization, including the appropriate temperature and pressure, can be effectively reached and maintained for the necessary duration to ensure all microorganisms are eradicated.