CER Principles and Maintenance 2

Question 1

Which parameter is most critical to monitor during automated endoscope reprocessing (AER) to ensure consistent disinfection?

Accepted Answer

Cycle time, temperature, and chemical concentration together

Answer

AER efficacy depends on simultaneous control of cycle time, temperature, and disinfectant concentration as validated during machine qualification.

Question 2

What is the purpose of leak testing an endoscope before immersion in liquid detergent?

Accepted Answer

To detect breaches in the endoscope's protective sheath that could allow fluid ingress

Answer

Leak testing identifies compromised seals or perforations before immersion so that fluid does not enter internal channels and cause irreparable damage.

Question 3

High-level disinfection (HLD) of flexible endoscopes is sufficient rather than sterilization because:

Accepted Answer

Heat-sensitive materials cannot withstand sterilization cycles and HLD eliminates all pathogens except high numbers of bacterial spores

Answer

Semi-critical devices like endoscopes require HLD because they contact mucous membranes, and HLD kills all microorganisms except large numbers of bacterial spores, which pose minimal risk to intact membranes.

Question 4

When should the minimum effective concentration (MEC) of a high-level disinfectant be tested?

Accepted Answer

Before each day of use or per manufacturer instructions

Answer

MEC testing before each day of use ensures the disinfectant remains potent enough to achieve HLD throughout the workday.

Question 5

Which type of water is recommended for the final rinse step after high-level disinfection of endoscopes?

Accepted Answer

Sterile water, filtered water, or water meeting specific microbiological standards

Answer

Sterile or microbiologically controlled water prevents recontamination of the endoscope from waterborne organisms like Pseudomonas during the final rinse.

CER - Certified Endoscope Reprocessor Practice Test

CER - Certified Endoscope Reprocessor Practice Test

CER Principles and Maintenance 2