serum total thyroxine

hormone

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In hyperthyroidism: Diagnosis of hyperthyroidism
…thyroxine can be measured as serum total thyroxine or free thyroxine; the latter is preferable because it is the form of thyroxine that is readily available to the cells of the body and, therefore, is metabolically active. Measurements of serum total thyroxine are high in patients with thyroid disease and…
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