ISO/IEC 17025 guide
ISO 17025 checklist: every ISO/IEC 17025 requirement in the order your laboratory will meet it, with the evidence assessors ask for
Clause by clause: ISO/IEC 17025:2017 requirements: every clause explained →
A 61-item checklist that takes ISO/IEC 17025:2017 from scope and impartiality to internal audit and management review in the order a laboratory project meets it, with the evidence assessors usually ask for and double weight where findings are most common.
Key points
- Sixty-one checks cover clauses 4 to 8 of ISO/IEC 17025:2017, arranged in the order a laboratory project usually reaches them rather than in clause-number order, each with the evidence an assessor typically asks to see.
- Tick an item only when its evidence exists for the methods on your application. A validation plan without results, or a procedure nobody has used yet, is still an open item.
- Thirteen items carry double weight. They cluster where, in Sterling's experience, laboratories most often receive findings: method verification and validation, measurement uncertainty, calibration and traceability, evidenced competence, quality control and proficiency testing, technical records, report content, impartiality and the technical reach of internal audit.
- The list is a working tool, not a gap analysis and not an assessment. Only the accreditation body assesses and grants accreditation; Sterling does not accredit.
How to use this checklist
The standard numbers its clauses from general requirements to the management system, but a laboratory rarely builds them in that sequence. Most projects first settle what the laboratory is and which tests or calibrations it will put forward, then protect impartiality, then set up document and record control so that everything written afterwards is controlled from the start. Resources follow, then the technical processes, and the evaluation clauses close the loop once enough work has run through the system to be audited.
Work method by method wherever an item concerns technical evidence. A laboratory applying for twelve methods needs the competence, equipment, verification or validation, uncertainty and quality control items to hold for all twelve, so it helps to keep a short matrix of methods against those items alongside this page.
Each evidence line shows what assessors commonly request. Technical assessors may choose other records, and they will watch your staff perform tests or calibrations, so an item is complete only when the person who does the work can also explain it. Items marked as a common assessment finding count twice in the progress score, which measures preparation, not the outcome.
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What this checklist is not
A page of ticks can feel like readiness. Keep in mind what it cannot do.
- Not the readiness check. Sterling's free online readiness check is a brief self-assessment before a project starts. This list is the inventory you complete while the project runs.
- Not a gap analysis. Sterling's gap analysis, the first stage of an engagement, reviews the laboratory against clauses 4 to 8 method by method, looking at documents, practice, records and people, and ends with agreed actions, owners and dates. A tick cannot tell you whether a bench practice matches the written method; observation can.
- Not the accreditation body's assessment. The body reviews your documents, may offer a pre-assessment, and then sends a lead assessor and technical assessors who witness the work before its committee decides.
- Not the standard. Every item paraphrases a requirement in plain language. The text of ISO/IEC 17025:2017, sold by ISO and national standards bodies, remains the reference.
Clause 5: Structure and the range of laboratory activities
Begin by fixing who the laboratory is and what it will claim. Every later item is tested against this boundary.
Clause 4: Impartiality and confidentiality
Assessors look for impartiality as a live risk process, not a signed statement, so set it up early and revisit it as the project changes the laboratory.
Clause 8: Management system foundations
Choose your option and put document and record control in place before the first procedure is written, so every later document is born controlled.
Clause 6: Personnel, facilities, equipment and traceability
Resources carry most of the technical weight of an assessment. Build the evidence per method and per instrument, not in general terms.
Clause 7: Requests, methods, sampling and test items
These items decide what the laboratory agrees to do and how. Method verification and validation usually take longer than any other part of the project, so start them as soon as the scope is settled.
Clause 7: Technical records, uncertainty and the validity of results
This is where assessors spend most of their time. A result that cannot be rebuilt from records, or quoted without a defensible uncertainty, rarely survives witnessing.
Clause 7: Reporting, complaints, nonconforming work and data
These items face the customer. They are tested on real reports and real complaints, so they need to be working rather than simply written.
Clause 8: Risks, improvement, corrective action, internal audit and management review
The closing items prove the system corrects itself. Under Option A they are requirements of ISO/IEC 17025 itself; under Option B the ISO 9001 system meets them, but assessors will still look for technical coverage.
What must be ready at application, and working by the on-site assessment
The accreditation body looks at the laboratory twice, at different depths. Its document review asks whether the system is designed and the scope is described properly; some bodies also offer an informal pre-assessment visit. The on-site assessment asks whether the work matches the documents, with a lead assessor on the management system and technical assessors who witness tests or calibrations. The table sets a target for each part of the checklist at each point.
| Checklist area | Ready at application and document review | Working by the on-site assessment |
|---|---|---|
| 5 Structure and scope | Range of activities and draft scope schedule complete | Scope matches what assessors see performed at each site |
| 4 Impartiality and confidentiality | Impartiality risk assessment and confidentiality agreements in place | Risk assessment reviewed; staff can explain how conflicts are handled |
| 8 System foundations | Option chosen; documents and records controlled | Current documents at the bench; records retrievable on request |
| 6 Resources | Competence criteria, equipment register, calibration programme and traceability chains documented | Authorised staff perform witnessed work; certificates reviewed; checks up to date |
| 7 Methods and results | Verification and validation files and uncertainty budgets complete for every method applied for | Quality control data and proficiency testing results available and acted on |
| 7 Reporting and data | Report templates checked; complaints and nonconforming work routes in place | Issued reports, complaints and nonconforming work records from real jobs |
| 8 Evaluation | Internal audit and management review scheduled | A full internal audit and a management review completed, with findings closed |
If a method does not yet meet the right-hand column, consider leaving it off the first application and adding it later as a scope extension, rather than risking findings across the whole assessment. What happens during the assessment, and the mistakes that most often cost laboratories time, are covered in separate guides.
The ISO/IEC 17025 assessment: document review, on-site assessment and witnessing
ISO/IEC 17025 common mistakes: the ten that fail assessments
How Sterling works through the checklist with you
Evidence for every method on your scope before the assessors arrive.
Sterling's expert and experienced consultants start with a gap analysis that reviews your laboratory method by method against every area on this list, then agree an owner and a date for each open item. We work alongside your technical staff on verification and validation, uncertainty budgets, traceability and proficiency testing plans, keep the management system records in Effivity, included with the engagement at no additional cost, and complete the internal audit and management review with you before the application. We ensure successful accreditation for our clients. Accreditation is granted by the accreditation body you apply to; Sterling does not accredit.
Book a free discovery callISO 17025 checklist: questions buyers ask
Must every item be ticked before we apply for accreditation?
Every item that applies to the methods on your application should be ticked before the on-site assessment, and most should be ticked before you apply. The table above shows which can still be maturing at application. A method that is not ready is usually better left for a later scope extension.
Does the checklist apply if we choose Option B?
Yes, for clauses 4 to 7 in full. Under Option B a management system meeting ISO 9001 covers the clause 8 items, but assessors still expect your internal audits and management reviews to reach the technical work, so those items remain a useful test.
Does every method need full validation?
No. Standard methods used as published need verification that your laboratory can perform them as intended. Full validation applies to methods developed in-house, modified, used outside their intended scope or not published as standards. The method validation guide explains the difference in detail.
Who in the laboratory should work through the list?
The quality manager or project coordinator, sitting with the technical manager and the people authorised for each method. Technical items ticked by someone who does not perform the method tend to reappear as findings when an assessor watches the work.
How long does it take to complete every item?
For a first accreditation, typically six to twelve months. Validation work, uncertainty evaluation and proficiency testing rounds, which run on the provider's calendar, set the pace more than the writing of procedures. The timeline guide sets out each stage.
Where are our ticks saved, and can we share them?
Only in this browser on this device; nothing is sent to Sterling. Print or save a PDF to keep or circulate a dated copy, and use Reset to clear the page. In a Sterling engagement the management system records sit in Effivity, so the team works from one set of evidence.
More ISO/IEC 17025 guides
Every guide in the ISO/IEC 17025 series is written for one question and links back to the hub for the whole picture.
- ISO/IEC 17025 accreditation process, step by step
- ISO 17025 benefits
- ISO 17025 for calibration laboratories
- ISO 17025 case study
- ISO 17025 for testing laboratories
- Choosing an ISO 17025 accreditation body
- ISO 17025 common mistakes
- ISO/IEC 17025 accreditation cost: what moves the price
- ISO/IEC 17025 documentation: what you need
- ISO/IEC 17025 internal audit: the technical clauses
- Measurement uncertainty under ISO/IEC 17025: a budget you can defend
- ISO/IEC 17025 requirements explained, clause by clause
Keep exploring
Explore more about ISO/IEC 17025
Watch a video on how to implement ISO 17025 here.
Watch a video on ISO 17025 requirements here.
ISO/IEC 17025 resources
Services for ISO/IEC 17025
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