How to Prepare Your Lab for ISO 17025 Assessment: A 14-Point Checklist

Introduction: Why Preparation Is a Year-Round Activity

An ISO 17025 assessment by your national accreditation body shouldn't be a once-a-year scramble. Labs that pass their assessment without Major Nonconformances are almost always labs that operate to ISO 17025 every day — not just in the weeks before the assessor arrives.

14-Point ISO 17025 Assessment Checklist

1. Document Management System (Clauses 8.2–8.3)

Verify your Quality Manual is current. Maintain a Document Master List with version numbers and approval dates. Ensure all controlled documents in use are the current approved version — no outdated forms or procedures.

2. Equipment Calibration Records (Clause 6.4)

Every piece of measuring equipment must have a current (non-expired) calibration certificate. Assessors will verify that the uncertainty stated in the certificate has been propagated into your results' uncertainty calculations.

3. Metrological Traceability Chain (Clause 6.5)

Document the full traceability chain for each measurement: lab instrument → reference standard → national measurement institute (NMI/NIMT). Each link must have a valid calibration certificate.

4. Personnel Records and Training (Clause 6.2)

Maintain a Competency Matrix showing which staff are authorised for which measurement activities. Training records must show both the training completed and the assessment of competence.

5. Method Validation / Verification (Clause 7.2)

Methods used must have documented validation (for in-house methods) or verification (for standard methods like ISO or TIS) showing the lab can perform them within the stated performance criteria.

6. Measurement Uncertainty Budgets (Clause 7.6)

Assessors will review your uncertainty budgets against GUM principles. Budgets must include all significant Type A and Type B contributors, combined uncertainty, and coverage factor k.

7. Sample / Item Receipt Records (Clause 7.4)

Maintain a chain of custody from item receipt through testing to return or disposal. Record the item's condition at receipt — any anomalies must be documented and reported to the customer.

8. Results Review Before Issue (Clause 7.8)

Have a documented process for reviewing results before a certificate is issued. Records must show who reviewed the result and when.

9. Nonconforming Work / OOS (Clause 7.10)

Define and document your process for handling results that don't meet acceptance criteria. Record every OOS occurrence with root cause analysis and corrective action.

10. Open CAPA Items (Clause 8.7)

All open corrective actions must have a due date and owner. Assessors will check whether previous CAPAs were closed effectively — not just formally closed.

11. Internal Audit Records (Clause 8.8)

Internal audits must cover all requirements of the standard, typically annually. Records must include findings, nonconformances raised, and resulting CAPA.

12. Management Review Records (Clause 8.9)

Annual management reviews must address the specific inputs listed in clause 8.9 — internal audit results, customer feedback, corrective actions, risk assessment, and resource adequacy.

13. Customer Complaints (Clause 7.9)

Even if you have no complaints, demonstrate the process exists. Every complaint received must be recorded with the investigation and resolution.

14. Proficiency Testing (Clause 7.7)

Labs in scope must participate in relevant PT schemes at least annually. Records must show results, z-scores, and any corrective action taken for unsatisfactory results.

Using a Compliance Dashboard

LabSync's ISO 17025 compliance dashboard monitors all 14 dimensions above in real time. Equipment due for calibration, open CAPA items, untrained staff, and documents due for review are all surfaced automatically — so your lab is demonstrably audit-ready every day, not just in the weeks before the assessor's visit.