Why Internal Audits Matter for ISO 15189 Accreditation
An internal audit is a planned, documented review of whether your lab does what its own system says it does, and whether that system meets the standard. For ISO 15189 Accreditation, it is also direct evidence that your management system is working, not just written down.
Many accreditation bodies for medical laboratories expect to see a complete audit cycle, findings with corrective actions, and proof that results reached management review. Labs that treat the audit as a paperwork exercise usually discover the weakness during the external assessment.
What Changed in ISO 15189:2022 That Auditors Should Know
The 2022 edition reorganized the requirements and brought in a few shifts that directly affect how you audit:
Point-of-care testing requirements are now part of the main standard instead of a separate document.
Risk management runs through the whole system, not just a single clause.
Patient-centred language is stronger, covering impartiality, confidentiality and patient care.
Structure is regrouped into general, structural and governance, resource, process, and management system requirements.
If your checklist still follows the 2012 clause order, rebuild it. Auditing against the old structure creates gaps the assessor will notice quickly.
Planning the Audit Programme
Good audits start before anyone opens a file. Cover these points first:
Scope and frequency. Plan to cover every process and location across the accreditation cycle, giving higher-risk areas more frequent attention.
Auditor independence. Auditors should not review their own work. In a small lab, this may mean borrowing a trained auditor from another department or an external consultant.
Auditor competence. Train and record the qualifications of your internal auditors, covering both the standard and the technical discipline.
Criteria and sampling. Define what you are auditing against (the standard, your manual, SOPs, regulatory requirements) and how many records you will sample.
The ISO 15189 Internal Audit Checklist
Use the sections below as a working structure. Each question should be answered with a record, an observation or an interview, not an assumption.
1. General, Structural and Governance Requirements
Is the lab’s legal identity clear, with defined responsibilities for its director and management?
Are impartiality risks identified and reviewed regularly?
Is patient and client confidentiality protected in practice, including in reports, sample handling and data storage?
Are the lab’s scope of services and the services being delivered consistent?
2. Resource Requirements
Does each staff member have a current job description, documented competence assessment and training record?
Is the facility suitable for the testing performed, with environmental conditions monitored where they affect results?
Is every piece of equipment identified, maintained, verified or calibrated at defined intervals, and traceable to its records?
Are reagents and consumables checked on receipt, stored correctly and used within expiry?
Are external suppliers and referral labs evaluated, and are their performance records on file?
3. Process Requirements
This is the largest section for most labs, and where technical findings tend to appear.
Pre-examination: Are test request forms complete, and are sample collection, labelling, transport and rejection criteria followed and recorded?
Examination: Are methods verified or validated before use? Is measurement uncertainty considered where it applies?
Quality assurance: Is internal quality control run and reviewed? Are results from proficiency testing or inter-laboratory comparison evaluated and acted on?
Post-examination: Are results reviewed and authorized by qualified staff? Are critical values communicated and documented?
Reporting: Do reports contain the information the standard requires, and are amended reports traceable?
Complaints and nonconforming work: Are they logged, investigated and closed with evidence?
4. Management System Requirements
Are documents controlled, current and available at the point of use?
Are records legible, retained for the defined period and protected from loss?
Are risks and opportunities for improvement identified and tracked?
Are quality indicators defined, monitored and reviewed?
Are corrective actions addressing root causes, with checks on effectiveness?
Is management review held at planned intervals, using the audit results as an input?
A Mini-Scenario: How One Small Finding Grows
Consider a lab where an auditor traces a haematology analyser. The calibration certificate is on file, but the verification after a service visit was never recorded. Patient results were released in the meantime.
The auditor’s note is short, but the implications are not. The lab now has to assess whether results are affected, document the investigation and close the process gap. Found internally, this is a manageable corrective action. Found by an assessor, it becomes a formal nonconformity with more scrutiny of the rest of your equipment records.
Also read : ISO 17025 Renewal Checklist: How FDASINDIA Makes Compliance Simple
Running the Audit and Writing Findings
During the audit, follow a simple rhythm:
Hold an opening meeting to confirm scope, schedule and criteria.
Collect evidence through record review, observation and staff interviews.
Trace at least one patient sample from request to report.
Grade findings clearly as nonconformities, observations or opportunities for improvement.
Close with a meeting to confirm that findings are understood.
Write each finding with three parts: the requirement, the evidence and the gap. Vague statements such as “records incomplete” slow down corrective action. Precise ones such as “calibration verification missing for analyser ID X after service on a given date” speed it up.
Closing the Loop With Corrective Actions
An audit has value only when findings lead to change. Assign an owner and a deadline for each finding, ask for root cause analysis instead of quick fixes, and verify that the action worked. Feed the trends into management review so recurring problems get resources and not just reminders.
Beyond Medical Labs: Related Accreditation Routes
The audit discipline here applies across other lab types, though each follows its own standard. Organizations exploring clinical laboratory accreditation in india typically work with NABL, and the same preparation habits support clinical lab accreditation and medical lab accreditation more broadly. Facilities that serve manufacturers may also look at testing lab accreditation, medical device testing lab accreditation and calibration lab accreditation, which are generally assessed against ISO/IEC 17025 rather than ISO 15189. Understanding the full laboratory accreditation process, from application and document review to assessment and surveillance, helps you time your internal audits sensibly.
Practical Takeaway
A strong internal audit is specific, evidence-based and tied to action. Use the checklist above to build your own version, map it to ISO 15189:2022 clauses, train independent auditors, and make sure every finding is closed with proof. Do this once a cycle and your external assessment becomes a confirmation of what you already know about your lab.
If your lab needs expert guidance on gap analysis, audit preparation or accreditation support, Contact FDASIndia today to plan your accreditation journey with fewer surprises and a faster path to approval.
Call Us : +91 8448278215 / +91 8448278215
Email : fdasindia@hotmail.com
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