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TNI Recognizes ACLASS as Accreditor for Proficiency Test Providers

The NELAC Institute (TNI) has recognized the ANSI-ASQ National Accreditation Board/ACLASS as an accrediting organization for proficiency test (PT) providers that provide PT samples to laboratories under TNI's National Environmental Laboratory Accreditation Program (NELAP).

TNI established NELAP to recognize laboratories that have demonstrated competence to perform environmental analyses. All PT providers accredited under TNI's program are required to undergo on-site assessments conducted by accrediting organizations such as ACLASS.

To determine that ACLASS programs meet the goals to be a PT provider accreditor, TNI reviewed ACLASS's organizational polices, evaluation practices, and standards. As a condition of TNI's recognition, ACLASS will be evaluated at least once every two years.

The ANSI-ASQ National Accreditation Board provides accreditation services under the ACLASS and ANAB brands. Under the ACLASS brand, the organization accredits ISO/IEC 17025 testing and calibration laboratories, ISO/IEC 17020 inspection bodies, ISO Guide 34 reference material producers, ISO/IEC 1704 proficiency test providers, and industry specific accreditation programs. Under the ANAB brand, the organization is the U.S. accreditation body for management systems and accredits certification bodies for ISO 9001 quality management systems; ISO 14001 environmental management systems; ISO 22000 food safety management systems; ISO 28000 supply chain security management systems; ISO/IEC 20000-1 information technology service management systems; ISO 27001 information security management systems; ANSI/AIHA Z10, CSA Z1000, and BS?OHSAS 18001 occupational health and safety management systems; PS- Prep; and numerous industry-specific requirements.

The ANSI-ASQ National Accreditation Board is a member of the International Laboratory Accreditation Cooperation (ILAC) and the International Accreditation Forum (IAF), and is a signatory of the ILAC and IAF multilateral recognition arrangements. Through these arrangements, the ANSI-ASQ National Accreditation Board cooperates with other accreditation bodies around the world to provide value to the organization it has accredited and their clients, ensuring that accredited certificates are recognized nationally and internationally. The global conformity assessment system ensures confidence and reduces risk for customers engaging in trade worldwide.

For more information about ACLASS, visit

For more information about ANAB, visit

The NELAC Institute (TNI) is a non-profit organization whose mission is to foster the generation of environmental data of known and documented quality through an open, inclusive, and transparent process that is responsive to the needs of the community.

For more information about TNI, visit


Jana Zabinski

Senior Director, Communications & Public Relations


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Beth Goodbaum

Journalist/Communications Specialist


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