ISO 13528:2022/Amd 1:2026

• Status: Published
• Publication Date: 27-Jul-2026
• ICS: 03.120.30 - Application of statistical methods
• Technical Committee: ISO/TC 69/SC 6 - Measurement methods and results
• Drafting Committee: ISO/TC 69/SC 6 - Measurement methods and results
• Current Stage: 6060 - International Standard published
• Start Date: 28-Jul-2026
• Due Date: 12-Jul-2026
• Completion Date: 28-Jul-2026

• Amends: ISO 13528:2022 - Statistical methods for use in proficiency testing by interlaboratory comparison
• Effective Date: 13-Jul-2024

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

• 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.

• 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.

• 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.

• 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.

• 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.

International
Standard
ISO 13528
Third edition
Statistical methods for use
2022-08
in proficiency testing by
interlaboratory comparison
AMENDMENT 1
2026-07
AMENDMENT 1
Méthodes statistiques utilisées dans les essais d'aptitude par
comparaison interlaboratoires
AMENDEMENT 1
Reference number
ISO 13528:2022/Amd.1:2026(en) © ISO 2026

ISO 13528:2022/Amd.1:2026(en)
© ISO 2026
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
or ISO’s member body in the country of the requester.
ISO copyright office
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Website: www.iso.org
Published in Switzerland
ii
ISO 13528:2022/Amd.1:2026(en)
Foreword
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...

Norme
internationale
ISO 13528
Troisième édition
Méthodes statistiques utilisées
2022-08
dans les essais d'aptitude par
comparaison interlaboratoires
AMENDEMENT 1
2026-07
AMENDEMENT 1
Statistical methods for use in proficiency testing by
interlaboratory comparison
AMENDMENT 1
Numéro de référence
ISO 13528:2022/Amd.1:2026(fr) © ISO 2026

ISO 13528:2022/Amd.1:2026(fr)
DOCUMENT PROTÉGÉ PAR COPYRIGHT
© ISO 2026
Tous droits réservés. Sauf prescription différente ou nécessité dans le contexte de sa mise en œuvre, aucune partie de cette
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être demandée à l’ISO à l’adresse ci-après ou au comité membre de l’ISO dans le pays du demandeur.
ISO copyright office
Case postale 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Genève
Tél.: [phone]
E-mail: [e-mail]
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Publié en Suisse
ii
ISO 13528:2022/Amd.1:2026(fr)
Avant-propos
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sous-comité SC 6, Méthodes et résultats de mesure.
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