ISO/IEC 17025

4.5.4
The lab must maintain a Register of Subcontractors list. Records of compliance with ISO 17025 must be available.

Interpretation:
If a subcontractor is not accredited for the specific service, the lab must ensure that qualified and trained personnel conduct an onsite assessment of the subcontractor's facilities and must conduct regular reassessments, or otherwise ensure to the accreditation body's satisfaction the adequate competence of the subcontractor. The lab must retain records of training and qualifications of the personnel that conduct such assessments. Such an on-site assessment must cover at least all the elements of ISO 17025. Evidence of this assessment as well as findings and their resolution, must be available for review. Evidence of compliance to ISO 17025 is not applicable in the case of customer or regulator specified subcontractors.

iso 17025