What is within-lab reproducibility?

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Within-lab reproducibility looks at how consistent results are when the same instrument is used by different operators under similar conditions in the same lab. It tests whether measurements are robust to who is operating the instrument, ensuring the process yields similar results regardless of the technician’s technique or handling, as long as the conditions stay the same. This helps show reliability of the method within a single facility.

If measurements vary when the instrument is used in different labs, that falls under between-lab reproducibility, where environmental differences, calibration standards, and instrument types can introduce more variability. Saying the variation is only due to temperature focuses on a single factor rather than the overall agreement among operators using the same setup. And the idea of variation that cannot be measured isn’t meaningful for assessing reproducibility, which is all about quantifiable differences in results.