What is Proficiency Testing?

Proficiency testing is the evaluation of participant performance against pre-established criteria by means of inter-laboratory comparison. (ISO/IEC 17043: 2023)

What makes PTC different?

We provide personalized services that are unique to your needs. For most PT schemes, PTC provides four samples per round, twice a year. With a few exceptions, samples are not concentrated so they arrive ready for analysis. This provides participants with PT that covers a concentration range with each PT round, in a format that more closely represents real samples than is available from most other PT provider. Preliminary reports are issued within one week of the study close, shortly followed by the official report. Final Reports consist of two parts: 1) the confidential report that contains performance evaluations and other confidential information, and 2) summary reports for each PT scheme that contains summary statistics and various graphical representations to help participants investigate any questionable performance. PTC also encourages participants to contact PTC staff with any concerns they may have with their PT reports and evaluations. All concerns are investigated and responded to in a timely manner. Should an investigation result in the identification of a probable PTC error, a revised report will be sent to the participant as well as to other participants that may be affected by the same error.