This International Standard specifies the requirements for competence to carry out reference measurement procedures in laboratory medicine, using the requirements of ISO/IEC 17025:2017 as a normative reference and listing additional requirements for calibration laboratories to perform their tasks adequately. The relationship between clauses in this international standard and ISO/IEC 17025:2017 are summarized in Annex A. Examinations of properties with results reported on a nominal or ordinal scale are not included. This International Standard is not applicable to medical laboratories. NOTE 1 – It is the laboratory’s responsibility to comply with the relevant legal health and safety requirements. NOTE 2 – Requirements for medical laboratories are specified in ISO 15189.