See Also: free thyroxine index(medicine)
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thyroxine(dictionary)
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free thyroxine index (medicine)


free thyroxine index


An arbitrary value obtained by multiplying the triiodothyronine uptake by the serum thyroxine concentration; it largely corrects for variations in thyroid-bound globulin concentration by providing a clinically valid estimate of the physiologically active free thyroxine; direct assay or laboratory measurement of free serum thyroxine yields a more accurate value.