CER Scope Inspection and Testing 3 — Questions and Answers
Question 1: Which standard establishes the minimum acceptable leak test pressure range for flexible endoscopes?
- AAMI ST79
- Manufacturer's Instructions for Use (IFU) (Correct answer)
- CDC Healthcare Infection Control guidelines
- OSHA Bloodborne Pathogen Standard
Correct answer: Manufacturer's Instructions for Use (IFU)
The manufacturer's IFU specifies the exact pressure range for leak testing each specific endoscope model, and IFU requirements always take precedence.
Question 2: During inspection, the endoscope's air/water nozzle is found to be missing. What should the reprocessor do?
- Reprocess the scope and return it to service — the nozzle is cosmetic only
- Remove the scope from service; a missing nozzle prevents proper lens washing (Correct answer)
- Replace the nozzle from a parts bin before reprocessing
- Notify the charge nurse but continue reprocessing
Correct answer: Remove the scope from service; a missing nozzle prevents proper lens washing
The air/water nozzle is required for adequate lens washing during procedures; a missing nozzle renders the scope non-functional and it must be removed from service.
Question 3: What does a 'negative' result on a leak test indicate?
- The scope failed and must be sent for repair
- No pressure loss was detected — the scope is intact (Correct answer)
- The internal channels are completely blocked
- High-level disinfection is not required
Correct answer: No pressure loss was detected — the scope is intact
A negative leak test result means no air loss was detected, confirming the scope's outer envelope is intact and safe to proceed with reprocessing.
Question 4: A colonoscope's bending section shows cracking in the rubber exterior but no bubbling during the leak test. The correct action is to:
- Return to service because the leak test passed
- Continue reprocessing but schedule repair within 30 days
- Remove from service — surface cracks can harbor pathogens and progress (Correct answer)
- Apply silicone sealant and retest before use
Correct answer: Remove from service — surface cracks can harbor pathogens and progress
Cracks in the bending rubber can harbor biofilm and microorganisms and will worsen over time, requiring removal from service even if no active leak is detected.
Question 5: The ocular eyepiece of a fiberoptic scope appears hazy and scratched. What is the most significant clinical implication?
- Reduced light delivery to the patient's anatomy
- Impaired visualization potentially compromising the procedure (Correct answer)
- Increased risk of patient infection
- Inability to perform leak testing
Correct answer: Impaired visualization potentially compromising the procedure
A hazy or scratched ocular eyepiece degrades the endoscopist's image quality, which can impair visualization and compromise procedural safety.
Question 6: Which of the following channel conditions would MOST indicate incomplete mechanical cleaning?
- Clear effluent from channel flushing after rinsing
- Brown or reddish discoloration in channel flush-through fluid (Correct answer)
- Slight resistance when advancing a cleaning brush
- Water droplets visible at the channel port after drying
Correct answer: Brown or reddish discoloration in channel flush-through fluid
Brown or reddish discoloration in flush-through fluid indicates residual blood or organic debris, signaling that mechanical cleaning was inadequate.
Question 7: When inspecting a bronchoscope's distal tip under magnification, the reprocessor observes that the biopsy port has a hairline crack. The appropriate response is to:
- Test the scope in saline to see if the crack leaks
- Remove from service and complete an incident report (Correct answer)
- Apply medical-grade adhesive and retest
- Use the scope for diagnostic procedures only, not biopsies
Correct answer: Remove from service and complete an incident report
A cracked biopsy port creates a pathway for fluid ingress and patient cross-contamination; the scope must be removed from service and the event documented.
CER Scope Inspection and Testing 3
Which standard establishes the minimum acceptable leak test pressure range for flexible endoscopes?