The concentration of circulating plasma thyroxine (T4) appears to have little effect on the maximal binding capacity of plasma thyroxine-binding globulin (TBG). Several studies in man have shown that thyrotoxicosis results in normal or slightly lowered levels of TBG, while hypothyroidism leads to a normal or slightly increased TBG binding capacity (Oppenheimer, Squef, Surks & Hauer, 1963; Inada & Sterling, 1967; Gordon, Kleinerman, Ehrenfeld & Ehrenfeld, 1971). In contrast the binding capacities of corticosteroid-binding globulin (CBG) and sex steroid-binding globulin (SBG) have been shown to be markedly affected by the level of circulating thyroid hormone. In the rat the binding capacity of CBG was markedly depressed by thyroid-ectomy and enhanced by chronic administration of T4 (Labrie, Raynaud & Fortier, 1965). Similarly, Dray, Mowszowicz, Ledru, Crépy, Delzant & Sebaoun (1969) administered T4 to normal human subjects and observed an increase of SBG concentration. Hyperthyroidism has been shown to
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