What distinguishes run acceptance criteria from lot acceptance criteria in QC?

What distinguishes run acceptance criteria from lot acceptance criteria in QC?

• A. Run acceptance criteria apply to a batch of runs; lot acceptance criteria apply to a single run.
• B. Run criteria apply to external QC; lot criteria apply to internal QC.
• C. Run criteria are for patient results; lot criteria are for calibration.
• D. Run acceptance criteria apply to a single analytical run; lot acceptance criteria apply to a batch of runs or reagents before usage.

Answer: (D)

The key idea is that run acceptance criteria are about validating a single analytical run, while lot acceptance criteria are about validating a batch of reagents or materials before it is used. For a single run, you check that all QC measures within that run—control results, calibrations, instrument stability, and any other predefined checkpoints—fall inside acceptable limits. If they do, the run is considered valid and its patient results can be reported; if not, the run is rejected and investigated. Before a newer batch or lot of reagents is used, you verify that the entire lot will perform consistently across multiple runs. This involves testing representative samples or verifying performance characteristics to ensure the lot won’t introduce variability or bias across the testing process. Only after this lot passes are reagents released for routine use. The other options don’t capture this distinction. One misstates the scope by swapping batch vs single-run, another mixes up internal vs external QC relevance, and another suggests calibration is the sole focus of lot criteria, which isn’t the defining difference.

The key idea is that run acceptance criteria are about validating a single analytical run, while lot acceptance criteria are about validating a batch of reagents or materials before it is used. For a single run, you check that all QC measures within that run—control results, calibrations, instrument stability, and any other predefined checkpoints—fall inside acceptable limits. If they do, the run is considered valid and its patient results can be reported; if not, the run is rejected and investigated.

Before a newer batch or lot of reagents is used, you verify that the entire lot will perform consistently across multiple runs. This involves testing representative samples or verifying performance characteristics to ensure the lot won’t introduce variability or bias across the testing process. Only after this lot passes are reagents released for routine use.

The other options don’t capture this distinction. One misstates the scope by swapping batch vs single-run, another mixes up internal vs external QC relevance, and another suggests calibration is the sole focus of lot criteria, which isn’t the defining difference.