1. ISO/IEC Guide 43 (1997) Proficiency testing by interlaboratory comparisons – Part 1: Development and operation of proficiency testing schemes. Part 2: Selection and use of proficiency testing schemes by laboratory accreditation bodies, ISO Geneva
2. EN 14136 (2004) Use of external quality assessment schemes in the assessment of the performance of in vitro diagnostic examination procedures, CEN Brussels
3. ISO/IEC 17025 (2005) General requirements for the competence of testing and calibration laboratories, ISO Geneva (first edition in 1999)
4. ISO 15189 (2003) Medical laboratories – Particular requirements for quality and competence, ISO Geneva
5. ISO/IEC 17011 (2004) General requirements for accreditation bodies accrediting conformity assessment bodies, ISO Geneva