working examination standard

https://doi.org/10.1351/goldbook.10029

Examination standard that is used routinely to calibrate or verify examining systems.

Note: A working examination standard is usually calibrated with respect to a reference examination standard.
Source:
PAC, 2018, 90, 913. (Vocabulary on nominal property, examination, and related concepts for clinical laboratory sciences (IFCC-IUPAC Recommendations 2017)) on page 931 [Terms] [Paper]