Understanding PT performance assessment


scorebasis 01All proficiency testing schemes include an assessment of laboratory performance. Most compare a laboratory result with an assigned value, and assess performance based on the difference and a criterion for successful performance. Often, this assessment also involves calculating a score for consistent interpretation across rounds and, sometimes, across PT schemes. But there are many different ways of determining an assigned value and setting a criterion for performance assessment, and there are several different scoring methods. 

This leaflet is intended to help participants in quantitative proficiency testing (PT) schemes to better understand the performance assessment made by the PT provider.


The leaflet is currently available in English.



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



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