ISO 17025:2017 In-Depth Approach in Consulting

New Generation Interpretations of Measurement Uncertainty, Decision Rules and Risk-Based Approach in Laboratory Accreditation

ISO/IEC 17025:2017 is a globally accepted standard for the accreditation of testing and calibration laboratories. However, while most consulting companies only address this standard at the "documentation" and "procedure" level, the most critical points of 17025 are actually related to technical verification, measurement uncertainty management, risk-based decision rules and integration into the laboratory's digital infrastructure.

1. Measurement Uncertainty: More than a Formula

• The use of Monte Carlo simulations in addition to the numerical methods of the EA-4/02 M manual provides a more accurate distribution of uncertainty, especially in complex measurement systems.
• Not only Type A/B components, but also operator effect (reproducibility), environmental variation and long-term stability of reference standards must be included in uncertainty budgets.
• Added value of consulting: Not only teaching the formula to laboratory personnel, but also verifying the uncertainty components with experimental data.

2. Decision Rules: The New Focus of Auditors

With ISO 17025:2017, decision rules have become mandatory. However, many companies still make this mistake:

• Declaration of conformity is made only with nominal value, without taking into account uncertainty.

Things to consider during the consultancy process:

• If there are no customer requirements, the laboratory itself must define a risk-oriented decision rule.
• Example: In a measurement where the tolerance limit is ±10 µm, if the uncertainty is 3 µm, the margin of safety should be deducted by the 'guard banding' method.
• Clearly stating this rule in every report is a critical control point in the audits of accreditation bodies.

3. Risk-Based Approach: Philosophical Change of 17025

• Risk example: Sudden departure of critical personnel → maintaining trained backup personnel.
• Opportunity example: Reducing human error with digital LIMS (Laboratory Information Management System) integration.
• In consultancy, it is necessary not only to create a risk list, but also to prepare an impact-probability matrix and control plan for each risk.

4. Digitalization and SCADA/LIMS Integration

• Integration of laboratory devices into the SCADA system
• Automatic reporting of results via LIMS
• Blockchain-based traceability of measurement data

5. Critical Points Highlighted in the Audits of Accreditation Bodies

• Justification of statistical methods used in uncertainty tables
• Integrating decision rules into customer contracts
• Internal verification plans are implemented with real data, not just on paper
• Performance tests proving the technical competence of the personnel (proficiency testing, interlaboratory comparisons)

Sample Measurement Uncertainty Table

Uncertainty Diagram (Representative)

Example Uncertainty Components Diagram

Frequently Asked Questions (FAQ)

What is ISO 17025 certification?
ISO 17025 is an accreditation that proves the technical competence and international validity of laboratories.

How to get ISO 17025 certificate?
The laboratory establishes the necessary systems, makes measurement uncertainty calculations and applies to the accreditation body. 

What is ISO 17025 measurement uncertainty?
It is the parameter that expresses the precision and confidence interval of a measurement result. It is mandatory to calculate in ISO 17025.

ISO 17025 Certificate Result and Communication

ISO 17025:2017 consultancy is not just about writing procedures or providing training. Real added value comes from strengthening the laboratory's measurement uncertainty model, clarifying decision rules, implementing risk management and integrating with digital infrastructure.

Astor Mayer Our approach is to develop technical, numerical and digital solutions specific to each laboratory's own processes; thus making the accreditation process not just an exam to be passed, but a sustainable quality culture.

ISO 17025 Training and Consultancy