COMPARISON OF THE LUMINESCENCE ENHANCED ENZYME IMMUNOASSAYS AMERLITE FT4 MAB-FT4 AND AMERLITE FT3/MAB-FT3 IN BLOODSERUM OF CHILDREN REFERENCE RANGES/

Concentrations of free thyroxine (n=225, male=124, female=101) and fre e triiodothyronine (n=60, male=35, female=25) were determined using th e luminescence enhanced enzyme immunoassay methods Amerlite FT4/MAB-FT 4 and Amerlite FT3/MAB-FT3 in blood-serum of children. In contrast to the excellent agreement of the results between the Amerlite FT4 and MA B-FT4 method, a significant difference was found between the Amerlite FT3 and MAB-FT3 results. Therefore it was necessary to establish neu r eference ranges for the MAB-FT, method in childhood (cord blood=50, n= 272, male=183, female=89).