Medical Device Reprocessing Association of Ontario (MDRAO) Practice Exam

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What is the first step in a washer disinfector cycle?

  1. Wash with detergent

  2. Rinse

  3. Disinfection

  4. Pre-rinse to rehydrate blood and remove soil

The correct answer is: Pre-rinse to rehydrate blood and remove soil

The first step in a washer disinfector cycle is to pre-rinse to rehydrate blood and remove soil. This initial phase is critical because it prepares the items for more effective cleaning during the subsequent wash cycles. By rehydrating organic materials, such as blood and other biological substances, the process facilitates the removal of these contaminants. Effective pre-rinsing helps to prevent the drying of soil, which can make it more difficult to eliminate during washing. Following the pre-rinse, the washer disinfector goes through multiple additional steps, including washing with detergent, rinsing, and finally disinfection, but the initial pre-rinse is essential for optimal outcomes in the entire reprocessing cycle. This sequence ensures that the devices not only meet requisite cleanliness standards but also maintain safety and efficacy for future use.

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