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The urinary excretion of thyroid-stimulating hormone (TSH) has been measured by double antibody radioimmunoassay after concentration by dialysis followed by lyophilization. Among 30 normal subjects, the excretion was 5·6 ± 0·31 (S.E.M.) µu./h. No diurnal variation nor differences between sexes were discerned. In 14 primary hypothyroid subjects the urinary excretion was raised (P < 0·001) to 25·1 ± 3·3 µu./h. In 14 hyperthyroid and 7 hypopituitary subjects subnormal levels of 2·6 ± 0·2 and 2·5 ± 0·22 µu./h (P < 0·001) respectively, were found. Serum and urinary TSH concentrations were measured before, during and after an infusion of human pituitary TSH (MRC 70/9) in two subjects and showed a correlation.

Urinary TSH measurement is thus a good discriminant between normal and hyperthyroid or hypopituitary patients.