Certified Nurses Operating Room (CNOR) Practice Exam

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What is the minimum time required for Pre-vac sterilization at 270 degrees Fahrenheit?

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4 minutes

The minimum time required for pre-vac sterilization at 270 degrees Fahrenheit is 4 minutes. This method is used primarily for sterilizing heat-resistant items and involves the use of a vacuum to eliminate air from the chamber, which allows steam to penetrate and kill microorganisms effectively.

At 270 degrees Fahrenheit, the rapid process reduces the time needed for sterilization because the higher temperature increases the efficacy of the steam. It is essential that this time is strictly adhered to, as exposure for too short a duration may not effectively eliminate all pathogens, potentially leading to inadequate sterilization.

Other options provide longer durations that exceed the minimum required time, which may be more applicable for lower temperatures or for specific items that require a more extended exposure to the sterilizing conditions. However, for the specific condition of 270°F in a pre-vac system, 4 minutes is the recognized minimum time frame for effective sterilization.

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