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National Environmental Proficiency Testing Program

Proficiency Testing (PT) is defined as a means of evaluating a laboratory or testing organization's performance under controlled conditions relative to a given set of criteria through analysis of unknown samples provided by an external source. The PT program consists of:

The PT Program relies on consensus standards representing the best professional practice in the industry to establish the requirements for this program. The TNI Standard for PT Providers, Volume 3, is modeled after ISO/IEC Guide 43 "General Requirements for the Competence of Testing and Calibration Laboratories." TNI Standard Volume 4 is the requirements for a Proficiency test Provider Accreditor. The Standard is based on ISO/IEC 17011:2004 "Conformity Assessment – General Requirements for Accreditation Bodies Accrediting Conformity Assessment Bodies."

Getting Started

How to become a PT ProviderHow to become a PT Provider Accreditor

Easy Links

PT Providers PT Provider Accreditor Fields of Proficiency Testing

TNI & NELAC Standards TNI Method & Analyte Codes

Structure and Governance

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TNI Information