Quality specifications for the determination of copper, zinc, and selenium in human serum or plasma: evaluation of an approach based on biological and analytical variation.
Arnaud J, Weber JP, Weykamp CW, Parsons PJ, Angerer J, Mairiaux E, Mazarrasa O, Valkonen S, Menditto A, Patriarca M, Taylor A. Quality specifications for the determination of copper, zinc, and selenium in human serum or plasma: evaluation of an approach based on biological and analytical variation. Clin Chem. 2008 Nov; 54(11):1892-9.