Commutability is a property of a reference material such that values measured for that reference material and for representative clinical samples have the same relationship between 2, or more, measurement proce-dures for the samemeasurand (1, 2). Commutability is required when a reference material will be used as a common calibrator for clinical laboratory measure-ment procedures or will be used in an external quality assessment (proficiency testing) program to evaluate the agreement amongmeasurement procedures for re-sults from patient samples (3). Commutability is also requiredwhen a referencematerial will be used by an in vitro diagnostics manufacturer as part of their internal traceability procedures to value assign their product calibrators.
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Miller et al. (2013) studied this question.
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