The Metabolism of 3,3′-Diiodothyronine in Man*

Abstract
The production rate of 3,3′-Diiodothyronine (3,3′-T2) was measured in five healthy subjects after a single injection of [125I]3,3′-T2. The [I25I]3,3′-T2 was measured by immunoprecipitation. To reduce the large amount of nonspecific serum radioactivity (iodides, 3,3′-T2 metabolites, and proteinbound iodine), the sera were treated before the immunoprecipitation with an anion exchanger and polyethylene glycol (final concentration, 10%). The noncompartmental analysis of the data gave the following results: MCR, 0.52 ± 0.07 liters⁄min or 926 ± 142 liters⁄day (mean ± SD); and production rate, 23.7 ± 8.2 ng⁄min or 34 ± 12 µg⁄day.

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