CRCST Decontamination 3

Question 1

Which type of washer-disinfector uses a thermal disinfection cycle as defined by the A0 concept?

Accepted Answer

Thermal washer-disinfector (automated)

Answer

Automated thermal washer-disinfectors use the A0 concept, which measures the lethal effect of heat on microorganisms at a reference temperature of 80°C.

Question 2

What hazard is associated with using high-pressure air to dry instruments in the decontamination area?

Accepted Answer

It can aerosolize pathogens and contaminate the environment

Answer

Using compressed air to blow off water can aerosolize infectious droplets, creating an inhalation hazard for CS staff.

Question 3

Which term describes the physical removal of foreign material (soil, blood, tissue) from instruments, which is NOT sterilization?

Accepted Answer

Cleaning

Answer

Cleaning is the physical removal of soil and foreign material; it reduces the microbial load but is not the same as sterilization or disinfection.

Question 4

Why is it important to keep instrument sets submerged below the water surface in an ultrasonic cleaner?

Accepted Answer

To ensure cavitation action reaches all surfaces and to prevent aerosol generation

Answer

Keeping instruments below the water surface ensures full cavitation exposure and prevents contaminated aerosols from being released into the air.

Question 5

A CS technician notices a brown discoloration on stainless steel instruments after washing. This is most likely caused by:

Accepted Answer

Hard water minerals or inadequate rinsing

Answer

Brown discoloration (staining) on stainless steel is most often caused by mineral deposits from hard water or inadequate rinsing after washing.

(CRCST) Certified Registered Central Service Technician Exam Practice Test

(CRCST) Certified Registered Central Service Technician Exam Practice Test

CRCST Decontamination 3