Proficiency testing - how much and how often?


Factors affecting PT strategyAn accredited laboratory needs to define in which PT schemes it should enrol  and how often it should participate. The EURACHEM Proficiency Testing Working Group has produced an information leaflet to help laboratories select the right balance of areas of work and participation frequency.

This second edition is an editorial revision to reference recent guidance on PT.

The second edition is currently available in English. Links to translations of the first edition, available in 12 languages, are temporarily maintained on this page (below) for convenience while translations of the second edition are prepared.



Please consult the PT Working Group Chair if you would like to prepare a translation in your own language.

Previous editions

The first edition of this information leaflet can be found here, in our publication archive. Selected translations of the first edition are listed below for convenience pending translation of the second edition.


1. Dates show date of publication of the linked file on this website.

2. 2nd English edition first published 2022-07-30