Proficiency Test Providers

The following links are provided for organizations seeking assistance in finding acceptable, accredited proficiency test providers. The ANSI-ASQ National Accreditation Board/FQS does not endorse any accredited provider over any other accredited provider.

ACLASS Accredited PT Providers

American Association for Laboratory Accreditation (A2LA) Accredited PT Providers

National Association of Testing Authorities (NATA) Accredited PT Providers

EPTIS Database - Please note the ANSI-ASQ National Accreditation Board/ACLASS cannot verify that providers listed in the EPTIS database are accredited. The information contained in the EPTIS database is based on self-declarations from PT providers. Use of PT providers not accredited to ISO/IEC 17043 is subject to ANSI-ASQ National Accreditation Board/ACLASS approval.

International Accreditation New Zealand (IANZ) Accredited PT Providers

China National Accreditation Service for Conformity Assessment (CNAS) Accredited PT Providers



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ACLASS for accreditation of labs, inspection bodies, PT providers, and RMPs.


ANAB for accreditation of management system certification bodies.