The Thyroid Gland

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Abstract
(Concluded)*Laboratory Diagnostic Tests of Thyroid Function and DiseaseThe multiplicity of laboratory tests directed at an elucidation of thyroid function offers both a boon and a challenge to the physician. The time-honored determinations of basal metabolic rate and blood cholesterol, the widely used serum protein-bound iodine levels and thyroid uptake of radioactive iodine have been joined by the serum level of butanol-extractable iodine, the I131 conversion ratio, the thyroid I131 clearance, the salivary I131 excretion, the thyroid-suppression tests, the T.S.H. stimulation test, the in vitro erythrocyte uptake of I131-labeled triiodothyronine, to mention a few of the more prominent . . .