American Association for Laboratory Accreditation

Proficiency Testing Provider

Accreditation Program

A2LA's accreditation program for Proficiency Testing Providers is designed for providers of proficiency testing schemes who wish to demonstrate their competence by formal compliance with a set of internationally-acceptable requirements for the planning and implementation of proficiency testing programs. The program will also provide users of proficiency testing programs (laboratories, accreditation bodies, regulators, technical assessors, etc.) increased confidence that the programs being relied upon are being operated competently in accordance with specified technical and management system requirements.

A2LA has been offering accreditation to proficiency testing providers for over a decade as demonstrated by our first accreditation, granted in December 2000.

Accreditation Requirements

Proficiency Testing Providers are assessed against the general criteria found in ISO/IEC 17043:2010 General Requirements for Proficiency Testing.

Click on the "Download Application Documents" button to the right to obtain all documents relevant to the A2LA Proficiency Testing Provider Accreditation Program.


In addition to the general Proficiency Testing Provider accreditation program sub-programs have been developed in the following areas, which have associated with them additional, A2LA-published specific requirements for accreditation:

Click on the sub-programs listed above for more information about each.

Acceptance/Recognition of Accreditation in this Program

On July 26, 2014, A2LA became one of the inaugural signatories to the Asia Pacific Laboratory Accreditation Cooperation (APLAC) Mutual Recognition Arrangement (MRA) for the accreditation of proficiency testing providers. Interested in learning more about this important new recognition and how A2LA accreditation in this program may be accepted internationally as well as domestically by federal, state and private sector entities? Click on the following links for more information:

Advisory Committee

A2LA has developed a Proficiency Testing Provider Advisory Committee (PTPAC) to assist the Association by providing technical input on policy creation and decisions related to the Proficiency Testing Provider accreditation program. If you wish to participate on the PTPAC, we invite you to contact Rob Knake, A2LA Accreditation Manager, at