Overview
ISO 13528:2022/Amd 1:2026 is an amendment to the widely recognized ISO 13528 standard, which provides statistical methods for proficiency testing by interlaboratory comparison. Developed by the International Organization for Standardization (ISO), this amendment updates technical content and references to ensure full alignment with the latest practices and supporting standards, particularly ISO/IEC 17043:2023.
Proficiency testing is essential for evaluating the performance of laboratories, enhancing measurement quality, and ensuring data reliability. This standard plays a critical role in supporting these objectives by offering rigorous statistical frameworks for data interpretation and assessment in interlaboratory comparisons.
Key Topics
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Updated References to ISO/IEC 17043:2023
The amendment systematically replaces previous references to ISO/IEC 17043:2010 with ISO/IEC 17043:2023, ensuring alignment with the current requirements for proficiency testing providers and participants.
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Clarification of Statistical Definitions and Formulae
Changes include corrected formula references and updated terminology, such as clarifying the meaning of "standard deviation for proficiency assessment." These refinements support improved accuracy and understanding in statistical application.
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Amended Reporting and Documentation Requirements
Updates require proficiency testing providers to document the reasons for statistical assumptions and demonstrate that these assumptions are reasonable, as aligned with the latest ISO/IEC 17043:2023 clauses.
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Data Handling Procedures
Providers must have documented criteria and procedures for managing inappropriate results and identifying statistical outliers. The amendment refers to established best practices, including early removal of obvious data blunders recommended by IUPAC.
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Precision in Assigned Values and Scoring
Several numerical amendments-such as in Annex E’s assigned value rounding-ensure standardized data reporting and enhance the validity of performance scores.
Applications
ISO 13528:2022/Amd 1:2026 is valuable for a wide range of organizations involved in proficiency testing and interlaboratory comparisons, including:
- Testing and Calibration Laboratories
To demonstrate measurement competence and comply with accreditation requirements.
- Proficiency Testing Providers
For designing, conducting, and evaluating proficiency tests in a consistent, statistically robust manner.
- Accreditation Bodies
Assessing technical compliance of laboratories and proficiency testing schemes with current international standards.
- Quality Managers and Technical Assessors
Ensuring continuous improvement in measurement quality and laboratory performance.
- Industry Sectors
Such as food safety, environmental analysis, clinical diagnostics, and materials testing, all of which rely on reliable interlaboratory comparisons for regulatory compliance and market access.
Utilizing this amendment helps enhance trust in laboratory results, supports quality assurance programs, and sustains international recognition of testing capabilities.
Related Standards
For comprehensive implementation and best practices in proficiency testing and statistical methods, consider the following related standards:
- ISO 13528:2022 - Statistical methods for use in proficiency testing by interlaboratory comparison (core standard).
- ISO/IEC 17043:2023 - Conformity assessment - General requirements for proficiency testing.
- ISO/IEC 17025 - General requirements for the competence of testing and calibration laboratories.
- IUPAC Harmonized Protocol - Guidelines for proficiency testing and data outlier assessment used as reference in the amendment.
ISO 13528:2022/Amd 1:2026 represents a crucial step in keeping proficiency testing statistical methods current, reliable, and harmonized with evolving international best practices. Adopting this amendment supports laboratory quality systems, risk management, and regulatory compliance across diverse scientific and industrial domains.
Open preview (PDF)Statistical methods for use in proficiency testing by interlaboratory comparison — Amendment 1
