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Implicit in many studies of thyroidal function is the assumption that the rates of synthesis and degradation of thyroid hormone are equal (1-4). Yet this assumption has not been critically examined. Constancy of concentrations of serum precipitable iodine (SPI), particularly under conditions of environmental stress, need not indicate an equilibrium of this type, for interposed between the site of hormonal synthesis and the peripheral circulation is a large pool of stored hormone (1, 4-6). This pool is capable of maintaining, at least for a time, constancy of SPI, despite marked discrepancies between rates of hormonal production and degradation (7). A method has been devised for simultaneous estimation of the rate of degradation of thyroxine within the body and the rate of iodination of organic moieties within the thyroid gland.4 The equivalence of these two functions has been assessed in patients with diverse thyroidal states. In addition, the method has been applied to an evaluation of several factors which influence the degradation of thyroxine.

Simultaneous Estimation of Rates of Thyroxine Degradation and Thyroid Hormone Synthesis1