ISO/IEC 17043 Standard
Conformity Assessment — General Requirements for the Competence of Proficiency Testing Providers
The ISO/IEC 17043 standard is the authoritative international benchmark that specifies the general requirements for the competence and consistent operation of proficiency testing (PT) providers. It establishes the rigorous quality and statistical frameworks needed to ensure that the interlaboratory comparison schemes used to evaluate the performance of laboratories are executed fairly, accurately, and with scientific validity.
1. Overview of the Standard
Developed by the ISO Committee on Conformity Assessment (CASCO), ISO/IEC 17043 outlines what it takes for an organization to successfully develop, manage, and distribute proficiency testing schemes. In a PT scheme, identical sub-samples are sent to multiple participating laboratories (such as those accredited under ISO/IEC 17025 or ISO 15189) for testing or calibration. The PT provider then collects the data and uses strict statistical methods to determine whether each laboratory’s performance is acceptable. This standard ensures that the PT provider itself has the operational and statistical proficiency to act as an objective judge of laboratory quality.
(Note: This standard underwent a major update in 2023 to fully align with the high-level structure of other updated standards like ISO/IEC 17025).
2. Target Sectors Served by the Standard
ISO/IEC 17043 is utilized by specialty organizations that create validation benchmarks for testing and calibration laboratories globally, including:
Medical & Clinical Laboratories: Providers of PT schemes for blood testing, microbiology, genetics, and clinical chemistry (supporting ISO 15189 compliance).
Environmental Analysis: Providers distributing blind samples of soil, wastewater, and air filters to check for pollution monitoring accuracy.
Food & Beverage Quality: Organizers of testing schemes for food allergens, nutritional values, chemical residues, and bacterial pathogens.
Calibration & Metrology: Bodies coordinating interlaboratory comparison measurements for mass, temperature, electrical, and dimensional tolerances.
Forensic Sciences: Agencies providing blind testing for DNA matching, ballistics, fingerprint analysis, and drug toxicology.
3. Key Clauses of the Standard
The standard is designed around both stringent operational logistics and complex statistical design rules:
Clause 1: Scope: Specifies requirements for proficiency testing providers and their schemes.
Clause 2: Normative References: Integrates critical metrological documents (like ISO/IEC Guide 99 and ISO 13528 for statistical methods).
Clause 3: Terms and Definitions: Clarifies vital terms such as "assigned value", "proficiency testing item", "outlier", and "z-score".
Clause 4: General Requirements:
Impartiality: Keeping PT design and performance evaluations free from commercial, financial, or political influence.
Confidentiality: Ensuring that individual laboratory performance data is kept strictly anonymous and hidden from competitors.
Clause 5: Structural Requirements:
Defines the legal entity status, management accountability, and organizational structure of the PT provider.
Clause 6: Resource Requirements:
Personnel: Ensuring statistical and technical experts are qualified to analyze complex datasets.
Facilities & Equipment: Proper infrastructure to safely prepare, pack, and store PT samples.
Externally Provided Products & Services: Rigid criteria for outsourcing sample manufacturing or logistical dispatch.
Clause 7: Process Requirements:
Design of PT Schemes: Developing scientifically sound protocols, selecting appropriate parameters, and setting timelines.
Preparation of PT Items: Ensuring the distributed items are completely homogeneous (identical) and stable over time.
Statistical Design & Data Analysis: Applying valid statistical metrics (such as Robust Statistics) to determine the assigned "true" value and calculate performance metrics (e.g., z-scores).
PT Reports: Issuing highly scannable, detailed reports back to laboratories outlining global dataset distribution and individual ratings.
Clause 8: Management System Requirements:
Details requirements for internal audits, document controls, risk assessments, and continuous operational improvement.