Industrial testing guide
Laboratory Quality Control
Checks used to detect drift, contamination, bias and inconsistent test performance.
Quality note: real acceptance criteria, test methods and sampling requirements come from applicable specifications, standards and qualified technical authority—not from generic web guidance.
What this topic covers
Checks used to detect drift, contamination, bias and inconsistent test performance.
Core testing ideas
Control samples and reference materials can reveal changing method performance.
Blank, duplicate or check measurements serve different quality-control purposes.
Results outside laboratory control criteria require documented investigation.
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.