Use of surplus proficiency test items


Factors affecting PT strategyTest items are sometimes available from proficiency testing (PT) providers after the completion of a PT round. The EURACHEM Proficiency Testing Working Group has produced an information leaflet to advise laboratories on benefits and limitations of surplus PT laboratories select the right balance of areas of work and participation frequency.

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


The second edition is currently available in the following languages. Links to selected translations of the first edition 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, in nine languages. 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