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1 Laboratories should give priority to proficiency testing programs that operate in accordance with ISO/IEC 17043 and are accredited by CNAS. 2 PTPs accredited by CNAS, as well as those recognized by accredited bodies that have signed mutual recognition agreements (MRAs) for PTPs, involve proficiency testing programs that operate within the scope of their accreditation； 3 Verification plan for the ability of recognized bodies that have not signed a PTP MRA to operate PTPs recognized under ISO/IEC 17043 within their scope of recognition ； 4 International recognized proficiency testing programs for the operation of cooperation organizations, such as those carried out by the Asia-Pacific Laboratory Accreditation Cooperation (APLAC) and others ； 5 Inter-laboratory comparisons carried out by international authoritative organizations, such as international and regional inter-laboratory comparisons conducted by the International Committee of Weights and Measures (CIPM), the Asia-Pacific Metrology Programme (APMP), the World Anti-Doping Agency (WADA), etc ； 6 Verification plan for the ability of PTPs approved in accordance with ISO/IEC 17043 to operate outside their scope of approval ； 7 Inter-laboratory comparisons organized by industry regulatory authorities or industry associations ； 8 Inter-laboratory comparisons organized by other institutions. 9 Based on CNAS-RL02