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ISCB-RQ-17025 · Issue 1 - September 2026

Testing and Calibration Laboratory Accreditation Requirements

Applies to laboratories seeking accreditation for defined testing, calibration and, where included in the requested scope, sampling activities.

Document status and use

This ISCB applicant guide sets out the evidence and operating controls normally expected for this accreditation programme. It does not reproduce or replace the applicable ISO or ISO/IEC standard. Applicants must hold an authorised current copy and comply with all applicable requirements, legislation, scheme rules and formally issued ISCB criteria.

No recognition claim: references to IAF or ILAC publications identify technical criteria that may be relevant; they do not by themselves state or imply that ISCB is an IAF or ILAC arrangement signatory.

01

Applicable framework

The assessment hierarchy begins with the primary standard and includes applicable normative, regulatory, scheme-owner and ISCB documents. When requirements conflict, ISCB will identify the controlling criterion before assessment.

  • ISO/IEC 17025:2017 is the primary competence standard.
  • ISO/IEC 17011:2017 governs ISCB's accreditation process and decisions.
  • Applicable ILAC policies and guidance are used where relevant to the requested scope, including current requirements on proficiency testing, metrological traceability, measurement uncertainty and scopes.
02

Core organisational requirements

Legal status and responsibility

The applicant must be a legally identifiable entity, or a defined part of one, that can be held responsible for its conformity-assessment activities, contractual obligations and decisions.

Impartiality and independence

Identify, analyse, evaluate, treat, monitor and record risks to impartiality. Commercial, financial, ownership, relationship, consultancy and self-review threats must be controlled continuously.

Confidentiality and information security

Protect confidential information, personal data, intellectual property, examination or scheme security and electronic records. Disclosures must be legally authorised and appropriately communicated.

Organisation and governance

Define authority, responsibilities, reporting lines, committees and safeguards. Technical work, review and decisions must be assigned to competent and appropriately independent functions.

Competence and resources

Set competence criteria for every role affecting accredited activities; evaluate, authorise, monitor and periodically re-evaluate personnel. Control facilities, equipment, software and externally provided resources.

Controlled operations

Accept work only after confirming capability and scope. Use controlled methods and records, handle deviations, review outputs and ensure decisions are traceable to adequate objective evidence.

Management system

Maintain document and record control, risk and opportunity processes, complaints, appeals, nonconforming work, corrective action, internal audit, management review and continual improvement.

Accreditation claims

Claims, certificates, symbols and references to accreditation must be accurate, limited to the granted scope and changed immediately when accreditation is suspended, reduced, withdrawn or expires.

03

Service-specific technical requirements

  1. Define the proposed scope by matrix, measurand or analyte, method, item or material, range and capability as applicable.
  2. Demonstrate method selection, verification or validation, measurement uncertainty where relevant, decision rules, quality control and assurance of result validity.
  3. Maintain metrological traceability through suitable calibration, reference materials and documented traceability chains.
  4. Establish competence criteria, authorization and continuing monitoring for all personnel affecting laboratory results.
  5. Control facilities, environmental conditions, equipment, reference standards, reagents, software, data integrity, externally provided services and handling of test or calibration items.
  6. Participate in suitable proficiency testing or interlaboratory comparison and maintain a justified participation plan.
04

Minimum application and readiness evidence

Submit current, approved documents and representative implementation records. Templates without operational evidence are not sufficient.

01Legal identity, organisation chart and impartiality/confidentiality controls
02Scope schedule and current method list
03Competence matrix, authorizations and training records
04Method verification/validation and uncertainty records
05Equipment register, calibration, maintenance and intermediate checks
06PT/ILC plan, results and corrective actions
07Internal audit, management review, risks, complaints and corrective-action records
08Representative reports or certificates and completed contract reviews
05

Assessment, decision and continued accreditation

Application and scope review

ISCB reviews legal identity, requested scope, locations, resources, readiness and applicable criteria before quotation and assessment planning. Acceptance of an application is not a promise of accreditation.

Assessment

Assessment may include document review, office or remote assessment, on-site technical assessment, witnessing, interviews, vertical and horizontal record tracing, and evaluation of representative activities. The mix depends on scope and risk.

Nonconformities and decision

The applicant must determine causes, correct the specific issue, implement proportionate corrective action and provide evidence of effectiveness within the notified period. Accreditation decisions are made independently from assessment and only for demonstrated competence.

Maintenance

Accredited bodies must remain competent, comply with surveillance and reassessment, notify significant changes without delay, cooperate with witnessing and record access, address complaints and nonconformities, and control all accreditation claims.

06

Principal references

  • ISO/IEC 17025:2017
  • ILAC P9 (proficiency testing/interlaboratory comparisons)
  • ILAC P10 (metrological traceability)
  • ILAC P14 (measurement uncertainty in calibration)
  • ILAC G8, G17 and G18, as applicable

Document editions and external publications can change. The edition stated in the accreditation agreement, transition notice or other formal ISCB communication controls the assessment. Applicants should verify current editions before use.

Next step

Use the guide to prepare objective evidence