Concentrations of triiodothyronine, thyroxine and thyreotropin were determined using the radioimmunoassay method in blood serum of 369 (male = 231, female = 138) euthyroid children. Beyond the newborn age no significant difference were found for the triiodothyronine and the thyreotropin concentration. Compilation of the values resulted in a physiological triiodothyronine concentration of 1.96 +/- 1.11 (1s) ng/ml -3.02 +/- 1.71 (1s) nmol/l- and in a thyreotropin concentration of 1.50 +/- 1.48 (1s) microunits/ml for infants, children and juveniles. In opposition to these results the thyroxine concentration showed a clear age-specific dependence. The thyroxine concentration decreased continuously from the infant age- (120 +/- 27 (1s) ng/ml, 154.8 +/- 34.8 (1s) to the juvenile age (69.1 +/- 16.4 (1s) ng/ml, 89.1 +/- 21.2 (1s) nmol/l).
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