1. Clinical and Laboratory Standards Institute (CLSI). Using Proficiency Testing to Improve the Clinical Laboratory; Approved Guideline—Second Edition. CLSI document GP27-A2 (ISBN 1-56238-632-8). Clinical and Laboratory Standards Institute, 940 West Valley Road, Suite 1400, Wayne, Pennsylvania 19087-1898 USA, 2007.
2. Specimen materials, target values and commutability for external quality assessment (proficiency testing) schemes;Miller;Clin. Chim. Acta,2003
3. Why commutability matters;Miller;Clin. Chem.,2006
4. Reference materials and commutability;Vesper;Clin. Biochem. Rev.,2007
5. Creatinine measurement: state of the art in accuracy and inter-laboratory harmonization;Miller;Arch. Pathol. Lab. Med.,2005