LabQMHub Editorial Team · ISO 15189:2022 Quality Management Series
Laboratory professionals researching accreditation options quickly run into three ISO standards that sound related but are not interchangeable: ISO 9001, ISO/IEC 17025, and ISO 15189. Understanding how they relate — and why medical laboratories almost always end up at ISO 15189:2022 specifically — prevents a great deal of confusion during accreditation planning.
These three standards are not competitors; they form a family, with ISO 15189:2022 drawing structural DNA from both of the others while adding the clinical, patient-facing requirements neither general standard was built to address.
ISO 9001: The Generic Quality Management Foundation
ISO 9001 is a generic quality management system standard applicable to virtually any organization — a manufacturer, a hospital administration department, a software company — built around process management, customer satisfaction, and continual improvement, without any technical requirements specific to a particular industry or activity.
Its strength is universality: the same core framework of documented processes, management commitment, and improvement cycles applies whether the organization makes automobile parts or delivers professional services. Its limitation, for a medical laboratory, is precisely that universality — ISO 9001 says nothing about method validation, quality control statistics, or specimen handling, because it was never designed to.
ISO/IEC 17025: Technical Competence for Testing and Calibration
ISO/IEC 17025 addresses the general requirements for the competence of testing and calibration laboratories, adding exactly the technical rigor ISO 9001 lacks — method validation, measurement uncertainty, traceability of calibration, and the technical competence of personnel performing specific tests.
ISO 17025 is deliberately generic across testing disciplines — the same standard accredits a materials testing laboratory, an environmental testing laboratory, or a metrology calibration laboratory — which means, like ISO 9001, it has no built-in provisions for patient safety, clinical interpretation, or the ethical obligations unique to testing human specimens for medical decision-making.
ISO 15189:2022: Where Management and Technical Competence Meet Clinical Reality
ISO 15189:2022 was constructed specifically to combine ISO 9001’s management system discipline with ISO 17025’s technical competence rigor, then extend both with requirements no general standard addresses: patient-centred care, biological reference intervals, critical value notification, and the specific pre-examination, examination, and post-examination structure of clinical testing.
This is why a laboratory director familiar with ISO 9001 will recognize the management system backbone of ISO 15189:2022 — document control, corrective action, management review — while a laboratory scientist familiar with ISO 17025 will recognize the technical backbone — method validation, measurement traceability, quality control statistics — layered with clinical-specific requirements neither predecessor standard contains.
Why Medical Laboratories Choose ISO 15189:2022 Specifically
A medical laboratory could theoretically pursue ISO 9001 for general management credibility, or ISO 17025 for technical testing competence, but neither alone demonstrates what clinicians, regulators, and patients actually need confirmed: that a laboratory understands and controls the specific risks of testing human specimens for clinical care.
ISO 15189:2022 is therefore the standard specifically recognized by health authorities and accreditation bodies as fit for purpose in the medical laboratory context, and most national accreditation programs for clinical laboratories are built directly around it rather than around ISO 9001 or ISO 17025 individually.
When the Other Standards Still Matter to a Medical Laboratory
Some medical laboratories still reference ISO 17025 for specific reference measurement procedures or calibration activities that fall outside routine clinical testing, and a laboratory’s parent organization may separately hold ISO 9001 certification for broader institutional quality management covering non-laboratory functions.
In practice, though, a laboratory accredited to ISO 15189:2022 has already satisfied the vast majority of what ISO 9001 and ISO 17025 would separately require, since the standard was deliberately built to encompass both — pursuing all three simultaneously for the same clinical testing scope is rarely necessary or expected by accreditation bodies.
Frequently Asked Questions
Can a medical laboratory use ISO 9001 instead of ISO 15189:2022?
Technically it could pursue ISO 9001 certification, but this would not address the technical competence and clinical-specific requirements that health authorities and accreditation bodies expect from a medical laboratory, and is not typically accepted as equivalent to ISO 15189:2022 accreditation.
Is ISO 15189:2022 based on ISO 17025?
ISO 15189:2022 shares significant structural and technical DNA with ISO 17025, particularly around method validation and technical competence, but adds substantial clinical-specific content — patient care, biological reference intervals, and the total testing process — that ISO 17025 does not include.
Does a laboratory need all three certifications?
No — for routine clinical testing scope, ISO 15189:2022 accreditation already encompasses the relevant management and technical competence elements of both ISO 9001 and ISO 17025, making pursuit of all three for the same scope generally unnecessary.
Key Takeaways
- ISO 9001 provides a generic management system framework applicable to any organization, without technical or clinical specificity.
- ISO 17025 adds technical competence requirements for testing and calibration laboratories generally, still without clinical-specific content.
- ISO 15189:2022 combines management system discipline and technical competence rigor with requirements unique to clinical testing of human specimens.
- Health authorities and accreditation bodies specifically recognize ISO 15189:2022 as the appropriate standard for medical laboratories.
- Some medical laboratories still reference ISO 17025 for specific reference procedures, or sit within a parent organization separately holding ISO 9001.
- Achieving ISO 15189:2022 accreditation generally satisfies the relevant elements of both other standards for a laboratory’s clinical testing scope.
Conclusion
ISO 9001, ISO 17025, and ISO 15189:2022 are best understood as a family rather than competitors — each addressing a progressively more specific layer of what a medical laboratory needs to demonstrate, from general management discipline, to technical testing competence, to the full clinical context of patient care.
For a medical laboratory, ISO 15189:2022 is not simply one option among three; it is the standard purpose-built to combine everything the other two offer with what only a clinical laboratory actually requires.
Explore the full ISO 15189:2022 training series on this site to understand each of these medical-specific requirements in depth.
Source note: this article draws on “Quality Management in Clinical Laboratory Demystified” by Dr. Taleb Chalab Cham, ISO 15189:2022, ISO 9001:2015, ISO/IEC 17025:2017, and widely recognized clinical laboratory quality references including CLSI guidelines, CAP accreditation checklists, and WHO laboratory quality guidance.
