Basic instructions for participants in a proficiency testing scheme

Use of surplus proficiency test items Introduction Test items are sometimes available from proficiency testing (PT) providers after the completion of a PT round. The purpose of this information leaflet is to advise laboratories on benefits and limitations of surplus…

Selecting the right proficiency testing scheme for my laboratory Introduction Participation in Proficiency Testing (PT) is an important part of assuring the quality of test results in a laboratory. The time and effort required can be costly, especially for laboratories…

How to investigate poor performance in proficiency testing Introduction A 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,…

Understanding PT performance assessment Introduction This leaflet is intended to help participants in quantitative proficiency testing (PT) schemes to better understand the performance assessment made by the PT provider [1-4]. Performance assessment parameters Assigned value In order to assess individual…