IFCC Working Group Recommendations for Correction of Bias Caused by Noncommutability of a Certified Reference Material Used in the Calibration Hierarchy of an End-User Measurement Procedure

IFCC Working Group on Commutability, W. Greg Miller, Jeffrey Budd, Neil Greenberg, Cas Weykamp, Harald Althaus, Heinz Schimmel, Mauro Panteghini, Vincent Delatour, Ferruccio Ceriotti, Thomas Keller, Douglas Hawkins, Chris Burns, Robert Rej, Johanna E. Camara, Finlay MacKenzie, Eline van der Hagen, Hubert Vesper

Research output: Contribution to journalArticle

Abstract

Establishing metrological traceability to an assigned value of a matrix-based certified reference material (CRM) that has been validated to be commutable among available end-user measurement procedures (MPs) is central to producing equivalent results for the measurand in clinical samples (CSs) irrespective of the clinical laboratory MPs used. When a CRM is not commutable with CSs, the bias due to noncommutability will be propagated to the CS results causing incorrect metrological traceability to the CRM and nonequivalent CS results among different MPs. In a commutability assessment, a conclusion that a CRM is commutable or noncommutable for use with a specific MP is made when the difference in bias between the CRM and CSs meets or does not meet a criterion for that specific MP when compared to other MPs. A conclusion regarding commutability or noncommutability requires that the magnitude of the difference in bias observed in the commutability assessment remains unchanged over time. This conclusion requires the CRM to be stable and no substantive changes in the MPs. These conditions should be periodically reverified. If an available CRM is determined to be noncommutable for a specific MP, that CRM can be used in the calibration hierarchy for that MP when an appropriately validated MP-specific correction for the noncommutability bias is included. We describe with examples how a MP-specific correction and its uncertainty can be developed and applied in a calibration hierarchy to achieve metrological traceability of results for CSs to the CRM's assigned value.

Original languageEnglish
Pages (from-to)769-778
Number of pages10
JournalClinical Chemistry
Volume66
Issue number6
DOIs
Publication statusPublished - Jun 1 2020

Keywords

  • calibration
  • certified reference material
  • commutability
  • harmonization
  • standardization
  • traceability

ASJC Scopus subject areas

  • Clinical Biochemistry
  • Biochemistry, medical

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    IFCC Working Group on Commutability, Miller, W. G., Budd, J., Greenberg, N., Weykamp, C., Althaus, H., Schimmel, H., Panteghini, M., Delatour, V., Ceriotti, F., Keller, T., Hawkins, D., Burns, C., Rej, R., Camara, J. E., MacKenzie, F., van der Hagen, E., & Vesper, H. (2020). IFCC Working Group Recommendations for Correction of Bias Caused by Noncommutability of a Certified Reference Material Used in the Calibration Hierarchy of an End-User Measurement Procedure. Clinical Chemistry, 66(6), 769-778. https://doi.org/10.1093/clinchem/hvaa048