... establishing anaverage analyte value across a material, establishing an analyte concentration profileacross a material, or determining local contamination in a material. In some cases, forexample ... SCOPE5.1 A laboratory may apply QA to all or part of its operations. Where a laboratory claimscompliance against, or certification or accreditation to, a particular standard, it isimportant to ... performance of a particular test, the laboratory shall have or have access to the relevantmeasurement standard, as a means of calibration. 13.4.2 In some cases, a test and its performance is actually...