Evaluation of Thyroid Function

Abstract
EUTHYROID persons produce approximately 80 μg thyroxine (T4) and 50 μg of tri-iodothyronine (T3) daily. Although values for the rates of secretion or production of the individual thyroid hormones would be most desirable for evaluating a patient's thyroid status, the necessary kinetic studies are seldom clinically feasible, and reliance is therefore placed upon other tests and procedures. These include measurements of the concentration of the thyroid hormones in plasma, the hormone-binding capacity of the plasma proteins, the avidity with which the thyroid gland accumulates iodine, and the concentration of circulating thyroid-stimulating hormone (TSH).The Circulating Hormones . . .

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