CPGP · Question #170
Atypical results in microbiological testing often require which of the following actions? Response:
Why B is correct: Atypical microbiological results trigger a structured investigation, and environmental monitoring (EM) data is the first critical tool - it provides context about whether the facility conditions (air, surfaces, personnel) could explain the anomalous finding…
Question
Atypical results in microbiological testing often require which of the following actions? Response:
Options
- AImmediate re-testing of the sample
- BAssessment of environmental monitoring data
- CConsultation with a third-party laboratory for confirmation
- DIgnoring the results if they are slightly out of specification Answer: B
Explanation
Why B is correct: Atypical microbiological results trigger a structured investigation, and environmental monitoring (EM) data is the first critical tool - it provides context about whether the facility conditions (air, surfaces, personnel) could explain the anomalous finding, distinguishing a true contamination event from a one-off occurrence.
Why the distractors are wrong:
- A (Immediate re-testing): Re-testing alone is insufficient and can obscure root cause; investigation must precede or accompany re-testing to understand why the result was atypical.
- C (Third-party consultation): External labs may eventually be involved in complex cases, but this is not the standard first-line action and is unnecessary if internal EM data resolves the investigation.
- D (Ignoring slightly out-of-spec results): This violates GMP and regulatory requirements - all atypical results must be investigated, regardless of magnitude; dismissing them constitutes a data integrity failure.
Memory tip: Think of EM data as the "crime scene" for a microbiology lab - when something unusual shows up, you check the environment first to determine whether conditions were compromised before deciding on further action.
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