Laboratory Quality Control Practice Test

Documenting downtime that could affect test accuracy requires a full, traceable record of what happened and how it affects results. The best practice is to record how long the instrument was unavailable, the potential impact on results, QC results observed before and after the downtime, the actions taken to mitigate effects (such as re-running tests or applying adjustments), any maintenance performed, and notifying supervisors or QA. This creates an complete audit trail that lets you assess whether results were biased, compare QC performance across the downtime period, and drive corrective actions or preventive measures. It also supports regulatory and quality system requirements by showing responsibility and accountability.

Recording only downtime hours misses whether the instrument’s performance was affected, so it doesn’t help you judge data quality. Keeping a separate log with no QC data fails to connect downtime to actual test results. Recalibrating and forgetting the downtime ignores potential impact and loses important context for data integrity and traceability.