1. ISO/IEC 15189 (2007) Medical laboratories—particular requirements for quality and competence. ISO, Geneva
2. ISO/IEC Guide 43–1 (1997) Development and operation of proficiency testing schemes. ISO, Geneva
3. ISO/IEC 17043 (2010) Conformity assessment—general requirements for proficiency testing. ISO, Geneva
4. ISO/IEC Guide 43–2 (1997) Selection and use of proficiency testing schemes by laboratory accreditation bodies. ISO, Geneva
5. ILAC Guide 13 (2007). Guidelines for requirements for operation of proficiency testing schemes. International Laboratory Accreditation Cooperation