CER Principles and Maintenance Questions and Answers 5 — Questions and Answers
Question 1: What is the consequence of exposing an endoscope to a disinfectant solution below the MRC?
- The scope will be damaged internally but patients will remain safe
- Inadequate microbial kill, creating a risk of transmitting infection between patients (Correct answer)
- The scope will require longer forced-air drying time only
- No consequence occurs if the immersion time is significantly extended
Correct answer: Inadequate microbial kill, creating a risk of transmitting infection between patients
Below-MRC disinfectant cannot reliably achieve high-level disinfection, creating a direct risk of organism transmission to subsequent patients.
Question 2: When transporting a used endoscope from the procedure room to the reprocessing area, the scope must be:
- Carried openly to allow airflow and prevent moisture buildup
- Placed in a closed, puncture-resistant, leak-proof container labeled as a biohazard (Correct answer)
- Wrapped loosely in a sterile drape to protect the insertion tube
- Submerged in enzymatic solution in an open basin during transport
Correct answer: Placed in a closed, puncture-resistant, leak-proof container labeled as a biohazard
Biohazard-labeled, closed containers prevent cross-contamination and protect staff during transport of potentially infectious equipment.
Question 3: Which step must be completed before immersing an endoscope in high-level disinfectant for the first time in a reprocessing cycle?
- Autoclaving the scope body at 134°C for flash sterilization
- Performing a leak test to confirm the scope is structurally intact (Correct answer)
- Applying a protective sterile drape to the control body section
- Measuring and recording the scope's overall working length
Correct answer: Performing a leak test to confirm the scope is structurally intact
Leak testing must occur before HLD immersion to prevent reprocessing chemicals from entering a damaged scope and causing irreparable internal damage.
Question 4: What is the purpose of flushing endoscope channels with 70% isopropyl alcohol at the end of the reprocessing cycle?
- To provide an additional layer of high-level disinfection
- To facilitate drying by displacing residual water from internal channels (Correct answer)
- To chemically neutralize any remaining disinfectant in the channels
- To lubricate the internal channels before storage
Correct answer: To facilitate drying by displacing residual water from internal channels
Alcohol displaces residual water from internal channels, promoting rapid drying and inhibiting microbial growth during storage.
Question 5: Which practice is required when testing a high-level disinfectant solution with chemical test strips?
- Testing only at the start of each workday regardless of cycle volume
- Testing before each use per manufacturer instructions, recording results, and discarding below-MRC solution (Correct answer)
- Dipping the strip and visually estimating concentration without formal documentation
- Testing once per week when usage volume is considered low
Correct answer: Testing before each use per manufacturer instructions, recording results, and discarding below-MRC solution
Consistent pre-use testing with documentation ensures the disinfectant maintains effective concentration and provides an auditable quality record.
Question 6: What is the primary risk of using unfiltered tap water for the final rinse of a reprocessed endoscope?
- Tap water is too cold to effectively rinse away disinfectant residue
- Tap water may harbor waterborne pathogens such as Pseudomonas aeruginosa or nontuberculous mycobacteria (Correct answer)
- Tap water causes chemical reactions that degrade endoscope materials over time
- Tap water mineral deposits improve channel lubrication and scope performance
Correct answer: Tap water may harbor waterborne pathogens such as Pseudomonas aeruginosa or nontuberculous mycobacteria
Tap water can harbor waterborne organisms that recontaminate a properly disinfected endoscope, leading to patient infections.
Question 7: Which best describes the standard of guidance governing endoscope reprocessing practice in US healthcare settings?
- The OSHA Bloodborne Pathogen Standard alone is sufficient
- Multi-society guidelines from SGNA, AAMI, APIC, and ASGE/ACG interpreted together with the device IFU (Correct answer)
- The manufacturer's instructions for use (IFU) alone govern all reprocessing decisions
- Individual state health department regulations exclusively determine reprocessing practice
Correct answer: Multi-society guidelines from SGNA, AAMI, APIC, and ASGE/ACG interpreted together with the device IFU
Best practice requires integrating complementary guidelines from multiple professional societies alongside the device-specific manufacturer IFU.
CER Principles and Maintenance Questions and Answers 5
What is the consequence of exposing an endoscope to a disinfectant solution below the MRC?