primary examination standard

https://doi.org/10.1351/goldbook.10026

Examination standard established using a primary reference examination procedure, or created as an artefact, chosen by convention.

Source:
PAC, 2018, 90, 913. (Vocabulary on nominal property, examination, and related concepts for clinical laboratory sciences (IFCC-IUPAC Recommendations 2017)) on page 930 [Terms] [Paper]