Publication Archive

Leaflet - Investigating poor performance in proficiency testing (2019)

NOTE: This version of the Information Leaflet "Investigating poor performance in proficiency testing" has been superseded by a later edition, published in 2022. The latest edition can be found here.


Factors affecting PT strategyA laboratory will occasionally have a poor performance in a PT scheme. When this occurs, the laboratory should acknowledge it, carry out an investigation and document a review of possible causes, even if it decides not to take any specific action. This leaflet, prepared by the EURACHEM Proficiency Testing Working Group, gives advice for laboratories on how to best address such events. The leaflet is currently available in English. Further translations will be published when available.



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


*Publication dates are dates of website publication. English version first published on this site on 2020-01-07.

** Minor editorial amendment published 2021-10-07