Which ISO standard is focused on proficiency test providers?

The ISO standard specifically focused on proficiency test providers is ISO/IEC 17043. This standard outlines the requirements for organizations that conduct proficiency testing, which is intended to ensure that testing results are reliable and comparable. Proficiency testing helps assess the performance of laboratories and other entities involved in testing, ensuring that they can provide accurate and consistent results in their respective fields.

ISO/IEC 17043 establishes criteria for the design, implementation, and management of proficiency tests, including the selection of appropriate test materials, the statistical evaluation of results, and the requirements for reporting to participants. This standard plays a crucial role in maintaining quality assurance and credibility in laboratory testing.

The other standards mentioned serve different purposes. For instance, ISO/IEC 17025 is focused on the competence of testing and calibration laboratories, while ISO/IEC 17024 relates to organizations that certify individuals. ISO/IEC 17034 addresses the requirements for reference material producers. Therefore, ISO/IEC 17043 is the correct choice as it directly pertains to proficiency test providers, ensuring that their processes meet established quality standards.