What is ISO/IEC 17025? Laboratory competence and accreditation explained

Competence and trust for testing and calibration laboratories

Every day, decisions about product safety, medical treatment, environmental protection, and trade depend on laboratory results.

If those results are wrong, the consequences can be serious. That is why customers, regulators, and the public need confidence that a laboratory is competent and its results are reliable.

ISO/IEC 17025 is the international standard that provides that confidence for testing and calibration laboratories.

This guide explains what ISO/IEC 17025 is, how accreditation works, the standard’s key requirements, and how professionals can build expertise in it.

What is ISO/IEC 17025?

ISO/IEC 17025:2017, General requirements for the competence of testing and calibration laboratories, sets out the requirements a laboratory must meet to show that it operates competently and impartially, and can generate valid results.

It applies to all organizations performing laboratory activities, regardless of their size or the number of personnel. This includes testing laboratories, calibration laboratories, and laboratories that perform sampling associated with subsequent testing or calibration.

The 2017 edition replaced the 2005 edition. ISO reviewed and confirmed it in 2023, and it remains the current version.

Accreditation, not certification

One of the most important points about ISO/IEC 17025 is how conformity is recognized.

Organizations are usually certified against management system standards such as ISO 9001. Laboratories, however, are accredited against ISO/IEC 17025 by an accreditation body.

The difference matters. Accreditation is a formal recognition of technical competence for a defined scope of tests or calibrations, not only of a functioning management system.

Accreditation bodies cooperate through international mutual recognition arrangements, so results from an accredited laboratory can be accepted across borders. This reduces the need for repeat testing and supports international trade.

Who uses ISO/IEC 17025?

ISO/IEC 17025 is used by a wide range of laboratories, including:

• Environmental, food, and water testing laboratories
• Calibration laboratories for measuring instruments and equipment
• Materials, construction, and product testing laboratories
• Pharmaceutical and chemical testing laboratories
• Forensic laboratories
• Electrical, electronics, and telecommunications testing laboratories
• In-house laboratories within manufacturing companies

Medical laboratories typically use a related standard, ISO 15189, which is tailored to medical testing.

How ISO/IEC 17025 is structured

The 2017 edition is organized around five main groups of requirements:

General requirements

The laboratory must ensure impartiality, identifying and managing risks to it on an ongoing basis, and protect the confidentiality of information obtained during its activities.

Structural requirements

The laboratory must be a legal entity, define its organization and responsibilities, and specify the range of laboratory activities it performs.

Resource requirements

These cover the resources that make valid results possible:

• Personnel – competence, training, authorization, and monitoring
• Facilities and environmental conditions – suitable for the activities and not affecting results
• Equipment – suitable, calibrated, and maintained
• Metrological traceability – linking results to recognized references, such as the International System of Units (SI)
• Externally provided products and services – controlling suppliers that affect laboratory activities

Process requirements

These form the technical core of the standard, covering the full workflow from request to report:

• Review of requests, tenders, and contracts
• Selection, verification, and validation of methods
• Sampling and the handling of test or calibration items
• Technical records
• Evaluation of measurement uncertainty
• Ensuring the validity of results, for example through proficiency testing and interlaboratory comparisons
• Reporting results, including statements of conformity and the decision rule applied
• Complaints, nonconforming work, and control of data and information management

Management system requirements

The laboratory must operate a management system. The standard offers two options: Option A lists the management system requirements directly, while Option B allows a laboratory with a management system conforming to ISO 9001 to use it to meet these requirements.

Key concepts in ISO/IEC 17025:2017

• Risk-based thinking – laboratories address risks and opportunities instead of following purely prescriptive rules
• Performance-based requirements – the focus is on outcomes and valid results, giving laboratories more flexibility in how they meet requirements
• Information technology – requirements reflect the use of computer systems, electronic records, and electronic results
• Decision rules – when a laboratory states whether a result conforms to a specification, it must define how measurement uncertainty is taken into account

Benefits of ISO/IEC 17025 accreditation

• Confidence in results – customers and regulators can rely on the laboratory’s data
• International acceptance – results are more widely accepted across borders
• Market access – accreditation is often required by regulators and customers, or in tenders
• Fewer errors – structured methods, validation, and quality control reduce mistakes and rework
• Competitive advantage – accreditation shows independent evidence of technical competence

ISO/IEC 17025 and ISO 9001

Laboratories often ask whether ISO 9001 certification is enough. The two standards serve different purposes.

ISO 9001 shows that an organization has an effective quality management system. It does not assess whether a laboratory’s methods, equipment, and people can produce technically valid results.

ISO/IEC 17025 includes management system requirements, but its focus is technical competence: validated methods, measurement uncertainty, traceability, and the validity of results.

Many laboratories hold both. Through Option B, a laboratory with an ISO 9001 management system can build on it when implementing ISO/IEC 17025.

How to get started with ISO/IEC 17025

• Define the scope of tests or calibrations you want to be accredited for.
• Run a gap analysis against the requirements of ISO/IEC 17025:2017.
• Build or update the management system and technical procedures, including method validation and measurement uncertainty.
• Train personnel and record their competence and authorization.
• Participate in proficiency testing to demonstrate the validity of results.
• Conduct an internal audit and management review.
• Apply to an accreditation body for assessment.

Who should learn ISO/IEC 17025?

ISO/IEC 17025 knowledge is valuable for laboratory managers, quality managers, technical managers, laboratory analysts and technicians, consultants supporting laboratories, and professionals who assess laboratories.

It is also useful for professionals in industries that rely on laboratory data, such as manufacturing, food, pharmaceuticals, and environmental services.

Training paths for ISO/IEC 17025

Professionals can build ISO/IEC 17025 expertise through several PECB training paths available at MIC:

ISO/IEC 17025 Foundation

A good starting point for professionals who need to understand the main concepts and requirements of ISO/IEC 17025.

ISO/IEC 17025 Lead Implementer

This course develops the competence to implement and manage a laboratory management system based on ISO/IEC 17025. It is particularly relevant to laboratory and quality managers, and consultants preparing laboratories for accreditation.

ISO/IEC 17025 Lead Assessor

For professionals who want to develop the competence to assess laboratories against the requirements of ISO/IEC 17025.

Start your ISO/IEC 17025 learning journey with MIC

Reliable laboratory results underpin safety, quality, and trade, and laboratories need professionals who can build and maintain that reliability.

My ISO Certification (MIC) provides access to official PECB training, with study materials, the exam, and the certification application fee included.

Ready to build laboratory competence expertise?

Explore the ISO/IEC 17025 Lead Implementer course and take the next step toward helping laboratories deliver results that can be trusted.

---