According to VIM3, two or more results of measurement for the same measurand are metrologically
comparable if they are metrologically
traceable to the same metrological reference [2, Sec.
, [[x.sub.n], u([x.sub.n])] for a common measurand must be traceable to the same reference for them to be metrologically
comparable [3, definition 2.46].
Response of AACC, ADA, and EASD: We agree that the recommended name is metrologically
correct and that the IFCC method should be used for traceability and for anchoring of HbA1c assays, but we also agree that, for the time being, reported values should continue to be from methods calibrated according to NGSP to avoid significant confusion for clinicians and patients.
Secondary reference materials are metrologically
linked to primary reference materials through a well-characterized value-transfer protocol.
In agreement with a metrologically
correct approach, the IFCC C-SMCD has proposed that for the standardization and traceability of cTnI measurements, a reference measurement system is required (19, 26).
As a result, it was considered that establishing metrologically
traceable measurements of thyroid hormones would be of great support to the correct diagnosis and monitoring of therapeutic measures.
The most effective approach for achieving universal comparability of test results is the ability to trace the calibration of the routine assays back to an international metrologically
sound reference measurement system.