1. Westgard
QC
. Desirable specifications for total error, imprecision, and bias, derived from intra- and inter-individual biologic variation. http://www.westgard.com/biodatabase1.htm (Accessed March 2011).
2. Desirable routine analytical goals for quantities assayed in serum;Stöckl;Eur J Clin Chem Clin Biochem,1995
3. Analytical goals for the acceptance of common reference intervals for laboratories throughout a geographical area;Gowans;Scand J Clin Lab Invest,1988
4. International Federation of Clinical Chemistry (IFCC) Expert Panel on Theory of Reference Values. The theory of reference values. Part 5. Statistical treatment of collected reference values: determination of reference limits;Solberg;J Clin Chem Clin Biochem,1987
5. Quality goals in external quality assessment are best based on biology;Fraser;Scand J Clin Lab Invest,1993