– the intergovernmental organization through which Member States act together
     on matters related to measurement science and measurement standards.
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Joint Committee for Traceability in Laboratory Medicine (JCTLM)
The JCTLM was created in 2002 through a Declaration of Cooperation between the International Committee of Weights and Mesures (CIPM), the International Federation for Clinical Chemistry and Laboratory Medicine (IFCC), and the International Laboratory Accreditation Cooperation (ILAC) in response to the implementation of the European Community Directive 98/79/EC on in vitro medical devices. The Declaration of Cooperation was revised in 2012, following the revision of harmonized standards relating to higher order reference materials and methods.

The JCTLM Executive Committee oversees the operations of the JCTLM, and its Working Group 1 and Working Group 2 establish lists of available higher order reference materials, measurement procedures/methods and measurement laboratory services with respect to the technical basis laid down in the JCTLM Framework.

Dr Gary Myers
    American Association for Clinical Chemistry
    1850 K Street, Suite 625
    Washington, DC 200065
    United States of America
Dr Robert Wielgosz
    Bureau International des Poids et Mesures
    Pavillon de Breteuil
    F-92312 SÈVRES CEDEX


The presentations given at the following meetings are openly available:

  • JCTLM Members' and Stakeholders' Meeting 2019
    • Challenging the status quo
    • New approaches to improving quality in laboratory medicine
    • International standards and regulation of IVDs
    • Commutability
    • Harmonization of methods for difficult analytes
    • International projects to achieve standardization/harmonization
  • Dec. 2019

The presentations given at the following workshops can be downloaded by participants (username and password required):

Metrological approaches to purity determination for Primary Reference Materials:

Criteria for nominated nucleic acid reference materials:

Traceability Statements - References to the JCTLM:

  • JCTLM-EXEC/15-03, 2015, 2 pp
    This document provides advice to manufacturers and others on the appropriate manner to make reference to JCTLM - listing of reference materials, methods and services in any documentation in which information on metrological traceability is included.

Examples for Certificate of Analysis that mention use of serum densities to convert from mass fraction to concentration values: