Detailed description of a measurement according to one or more measurement principles and to a given measurement method, based on a measurement model and including any calculation to obtain a measurement result.
Notes: - A measurement procedure is usually documented in sufficient detail to enable an operator to perform a measurement.
- A measurement procedure can include a statement concerning a target measurement uncertainty.
- Measurement procedures in chemistry can be structured according to ISO 78-2 or Annex A of the Eurachem Guide "The Fitness for Purpose of Analytical Methods".
- An authorized measurement procedure is sometimes termed "standard operating procedure" (SOP) or "recommended operating procedure" (ROP).
- In ISO/IEC 17025, the term "method" is used for measurement procedure. "Examination procedure" is defined for medical laboratories.
- The historical term "assay" is now largely obsolete as a synonym for metrological terms such as measurement procedure but still used in composite terms, for example, immunoassay and bioassay.
Source:
PAC, 2021, 93, 997. 'Metrological and quality concepts in analytical chemistry (IUPAC Recommendations 2021)' on page 1011 (https://doi.org/10.1515/pac-2019-0819)