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A simple and sensitive radioimmunoassay for reverse T3 in urine using small Sephadex G25 fine columns is described. The recovery of rT3 added to urine was on average 101.0 +/- 4.2% (mean +/- SEM). Detection limit was 4 pg/column. Urine excretion of rT3 (mean +/- SD) was 72.0 +/- 32.1 ng/24 h in 61 healthy euthyroid subjects with a slight increase with age (P less than 0.05), 28.8 +/- 18.2 ng/24 h in 12 hypothyroid patients and 183.6 +/- 79.7 ng/24 in 25 hyperthyroid patients.
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