The Eurachem reading list

9. Proficiency testing

Websites and web resources


  • ISO 13528:2022. Statistical methods for use in proficiency testing by interlaboratory comparisons (
  • ISO/IEC 17043:2023. Conformity assessment  – General requirements for the competence of proficiency testing providers (


    • ILAC P9:01/2024, ILAC Policy for proficiency testing and/or interlaboratory comparisons other than proficiency testing (
    • Brookman and I. Mann (Eds) Eurachem Guide: Selection, use and interpretation of proficiency testing (PT) schemes by laboratories (3rd ed. 2021) (
    • EA-4/18 G: 2021, Guidance on the level and frequency of proficiency testing participation, (
    • EA-4/21 INF: 2018, Guidelines for the assessment of the appropriateness of small interlaboratory comparisons within the process of laboratory accreditation (


  • Eurachem information leaflets (
    • Let’s call a PT scheme a PT scheme! (2022)
    • How to investigate poor performance in proficiency testing (2nd edition, 2022)
    • Use of surplus proficiency test items (2nd edition, 2022)
    • Proficiency testing – How much and how often? (2nd edition, 2022)
    • Selecting the right proficiency testing scheme for my laboratory (2nd edition, 2022)
    • How can proficiency testing help my laboratory? (2nd edition, 2022)
    • Pre- and post-analytical proficiency testing (2nd edition, 2022)
    • Proficiency testing schemes and other interlaboratory comparisons (2nd edition, 2022)
    • Proficiency testing schemes for sampling (2020)
  • Eurolab cookbooks (
    • Doc No. 2, Criteria for the selection of a proficiency testing scheme, revision no. 4, 07/2020
    • Doc No. 4, Use of interlaboratory comparison data by laboratories, revision no. 5, 02/2021
    • Doc No. 17, Interlaboratory comparison: The views of laboratories, revision no. 3, 10/2018
  • AMC Technical Briefs, RSC, (
  • Under Statistical Analysis tab:
    • AMC TB 19A-2008, General and specific fitness functions for proficiency tests and other purposes – clarifying an old idea
    • AMC TB 18A-2005, What is proficiency testing? Guide for end-users of chemical data
    • AMC TB 18-2004, GMO Proficiency testing: Interpreting z-scores derived from log-transformed data
    • AMC TB 16-2004 (revised April 2007), Proficiency testing: assessing z-scores in the longer term
    • AMC TB 11-2002, Understanding and acting on scores obtained in proficiency testing schemes
    • AMC TB 02-2000 (revised December 2005), How to combine proficiency test results with your own uncertainty estimate – the zeta score

Articles and reports

  • ILAC B6:06/2019, Benefits for laboratories participating in proficiency testing programs (
  • I. Kuselman, A. Fajgelj, IUPAC/CITAC Guide: Selection and use of proficiency testing schemes for a limited number of participants – chemical analytical laboratories (IUPAC Technical Report). Pure Appl. Chem., 2010, 82(5), 1099-1135,
  • M. Thompson, S. L. R. Ellison, R. Wood, The International Harmonized Protocol for the proficiency testing of analytical chemistry laboratories, IUPAC Technical Report, Pure Appl. Chem., 2006, 78(1), 145-196, 


Return to reading list >>