The first paragraph stipulates that the service provider be accredited to ISO/IEC 17025, while the second paragraph requires that the tests requested be listed on the laboratory's scope of accreditation. If this requirement is not met, the laboratory could claim, for example, that it is ISO/IEC 17025 compliant even though it is not actually accredited for the tests specifically required.
The third paragraph stipulates that the AB should be an ILAC MRA signatory. (IAS is an ILAC MRA signatory.) It emphasizes the importance of using conformity assessment services accredited by an AB with the appropriate credentials without which it is not possible to be confident that the laboratory has been accredited by an AB competent to carry out the assessment. There are ABs that claim to be compliant with ISO/IEC 17011. Holding ILAC MRA signatory status indicates that the AB has been periodically peer-evaluated against the requirements of ISO/IEC 17011 and additional ILAC requirements.
For more information about specifying accreditation, contact IAS.
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