The term ‘proficiency testing’ is one that every accredited calibration laboratory is quite familiar with. In basic terms it refers to a method of evaluating how well a laboratory is doing a particular calibration with respect to its claimed measurement uncertainty and how it fares with other participants.
In the past, proficiency testing (PT) items and participation frequency were formulated by accreditation bodies, regardless of the scale, customer type, and economic conditions of a laboratory.
