Washer-disinfector

Sterile processing definition

A washer-disinfector is an automated machine that cleans instruments and then thermally or chemically disinfects them, moving through cycles such as prewash, enzyme wash, detergent wash, rinse, thermal rinse and drying. Instruments must be loaded so water can reach all surfaces, with hinged instruments open and items not stacked, and the cycle should be verified with cleaning indicators.

On the CRCST exam

Expect questions on correct loading (open, not overcrowded) and on testing that the washer is cleaning effectively.

Exam domain: Cleaning, Decontamination & Disinfection (about 21% of the exam)

Cleaning, Decontamination & Disinfection practice questions

How to keep instruments moist at point of use
How to transport contaminated instruments
Decontamination area air pressure
Spaulding classification of critical items

Ready for the full CRCST question bank?

Unlock every question, full-length timed mock exams and topic-by-topic progress tracking.

See plans