ISO 17025 Internal Audit Checklist

Use this ISO 17025 internal audit checklist to work through audit programme and planning, auditor competence and impartiality, clause-by-clause coverage, objective evidence, findings and nonconformities, and corrective actions and follow-up, logging issues with photos and notes and assigning corrective actions before sign-off.

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ISO 17025 Internal Audit Checklist

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Frequently Asked Questions

What is an ISO 17025 internal audit checklist?

An ISO 17025 internal audit checklist is used to plan and conduct an internal audit of a testing or calibration laboratory against ISO/IEC 17025:2017. It is built around the audit process: confirming the audit programme and scope, auditor competence and impartiality, clause-by-clause coverage, gathering objective evidence, stating findings and nonconformities against the requirement, and agreeing corrective actions to closure. It assesses an operating management system through auditing and feeds the results into management review, which makes it distinct from a first-time gap assessment or a general readiness checklist.

How is an internal audit different from a gap assessment?

A gap assessment usually happens before accreditation, to find where a laboratory does not yet meet ISO/IEC 17025 and to plan the work to close those gaps. An internal audit happens on an operating management system, on a programme, to confirm through evidence that it continues to conform and works in practice. One builds readiness; the other maintains and assures it. The internal audit is also more formal about auditor independence, objective evidence and verified corrective actions. This checklist is the internal audit; the gap assessment is a separate page.

Does it require a specific audit frequency or sample size?

No. ISO/IEC 17025 requires internal audits at planned intervals, but the frequency, the audit programme and the sample of records and activities depend on the laboratory's size, risks and history, so the checklist does not fix them. It confirms that a programme exists and covers all requirements over time, and that sampling is planned to give confidence across the scope, and lets you record what your programme uses. Set the actual frequency and sampling against your own risk-based programme rather than a universal rule.

How does InspectWrk help with internal audits?

In InspectWrk, an internal audit runs as a structured checklist: the auditor records the scope and criteria, works clause by clause capturing objective evidence, and raises each nonconformity against the specific requirement with its significance. Corrective actions are assigned to owners with due dates and tracked to verified closure, and the audit record feeds management review. Everything is timestamped and stored, so the laboratory has a defensible audit trail and can show that internal audits are genuinely closing issues rather than repeating them.

Digital inspection checklist running in the InspectWrk mobile app

What is an ISO 17025 internal audit checklist?

Quick Answer

An ISO 17025 internal audit checklist is used to plan and conduct an internal audit of a testing or calibration laboratory against ISO/IEC 17025:2017. It is built around the audit process: confirming the audit programme and scope, auditor competence and impartiality, clause-by-clause coverage, gathering objective evidence, stating findings and nonconformities against the requirement, and agreeing corrective actions to closure. It assesses an operating management system through auditing, and feeds the results into management review, distinct from a first-time gap assessment.

An ISO 17025 internal audit checklist is used to run an internal audit of a testing or calibration laboratory against ISO/IEC 17025:2017. Its purpose is to check, through objective evidence, that the laboratory's management system and technical activities conform to the standard and work in practice. It follows the auditing approach of ISO 19011: a planned programme, competent and impartial auditors, and findings based on evidence. It is for auditing an operating system, distinct from a first-time gap assessment.

Working through the audit programme and planning, auditor competence and impartiality, clause-by-clause coverage, objective evidence, findings and nonconformities, and corrective actions and follow-up, the checklist keeps the audit disciplined and its findings defensible. Because the scope and sampling depend on the laboratory's activities and the programme, the checklist covers the audit steps and lets you record what applies rather than prescribing a fixed sample.

Why internal audits become a tick-box exercise

Internal audits of a laboratory often drift into a formality: the same auditor reviews their own area, findings are opinions rather than evidence, and nonconformities are raised but never verified as closed. The audit satisfies the requirement on paper but gives management no real assurance, and the same issues reappear at the accreditation assessment.

An ISO 17025 internal audit checklist fixes that by holding the audit to the discipline of ISO 19011: a programme that covers everything over time, competent and impartial auditors, findings based on objective evidence tied to the requirement, and corrective actions verified to closure. The audit becomes a genuine source of assurance that feeds management review.

Before and After InspectWrk

Before InspectWrk

  • Auditors review their own areas and findings are opinions.
  • Nonconformities are raised but never verified as closed.
  • The same issues reappear at the accreditation assessment.

After InspectWrk

  • A programme covers all requirements with impartial auditors.
  • Findings rest on objective evidence tied to the requirement.
  • Corrective actions are verified to closure and feed management review.

Why is an ISO 17025 internal audit checklist important?

A disciplined internal audit gives real assurance, not a paper exercise:

  • Confirms the audit programme covers all requirements over time
  • Keeps auditors competent and independent of the work they audit
  • Bases findings on objective evidence tied to the requirement
  • States nonconformities clearly with their significance
  • Tracks corrective actions to closure and into management review

What should be included in an ISO 17025 internal audit checklist?

A complete internal audit runs from the programme to closure:

Programme and auditors

Set up the audit:

  • An audit programme covering all requirements over a period
  • Defined scope, criteria and schedule for this audit
  • Competent, impartial auditors who do not audit their own work

Evidence and findings

Audit against the standard:

  • Clause-by-clause coverage of the activities in scope
  • Objective evidence from records, observation and interview
  • Nonconformities stated against the requirement, with significance

Actions and follow-up

Close the loop:

  • Cause analysis and corrective action with an owner and due date
  • Verification that corrective actions are effective
  • Audit results recorded and fed into management review

How do teams use an ISO 17025 internal audit checklist?

Run the internal audit against the standard:

  1. Confirm the audit scope, criteria and schedule
  2. Confirm auditors are competent and independent of the audited activity
  3. Gather objective evidence clause by clause across the scope
  4. State findings and nonconformities against the specific requirement
  5. Agree corrective actions with owners and due dates
  6. Verify effectiveness, close the audit, and feed results into management review

See how this checklist fits into Professional Services inspection software.

This checklist runs as a mobile inspection app that works fully offline on site, with AI-powered defect detection on every photo. To see it on your own workflows, talk to our team.