Measurement of free thyroxine in laboratory medicine - proposal of measurand definition

Linda M. Thienpont*, Graham Beastall, Nicholas D. Christofides, James D. Faix, Tamio Ieiri, W. Greg Miller, Richard Miller, Jerald C. Nelson, H. Alec Ross, Catherine Ronin, Michael Rottmann, Jos H. Thijssen and Brigitte Toussaint 1 Laboratory for Analytical Chemistry, Faculty of Pharmaceutical Sciences, Ghent University, Ghent, Belgium 2 Department of Clinical Biochemistry, Royal Infirmary, Glasgow, UK 3 Research and Development, Ortho-Clinical Diagnostics, Cardiff Laboratories, Whitchurch, UK 4 Stanford Medical School, Palo Alto, CA, USA 5 Department of Clinical Laboratory Medicine, Dokkyo University School of Medicine, Japan 6 Department of Pathology, Virginia Commonwealth University, Richmond, VA, USA 7 Dade Behring Inc., Newark, DE, USA