In order to harmonize the accreditation of Laboratories  to the requirements of ISO/IEC 17025 and the approval of ABP Laboratories  to the requirements of ISO/IEC 17025 (or ISO 15189 ), as well as the WADA -specific requirements for accreditation or approval, Accreditation Bodies are required to use the ISL, including the applicable Annexes, Technical Document s, Technical Letters  and Laboratory Guidelines  as reference documents in their assessment process.