Measurement Uncertainty in Laboratories

What this topic covers

Identify and combine significant uncertainty contributions at a conceptual level.

Core testing ideas

Uncertainty can arise from references, repeatability, environment, resolution, setup and method effects.

A useful uncertainty statement matches the measured quantity and confidence convention.

Uncertainty should be considered when results are close to specification limits.

Measurement and method limits

Traceability requires documented measurement relationships, not simply a calibration sticker.

Evidence and traceability

Laboratory competence includes people, methods, equipment, environment, records and impartiality.

Using the result

Quality-control checks should detect drift or abnormal method performance before questionable results accumulate.