1981•Annals of Clinical Biochemistry International Journal of Laboratory MedicineRequires access

A Comparison of Free Thyroxine Concentration and the Free Thyroxine Index as Diagnostic Tests of Thyroid Function

J. W. Tuttlebee, R.G. Bird

Abstract

Serum free thyroxine concentrations, measured by the Immo Phase kit, and free thyroxine index values were compared in 200 subjects classified according to age, sex, and clinical diagnosis. The free thyroxine concentration was as good as the free thyroxine index in hyperthyroid, hypothyroid, elderly, and acutely ill patients and a better diagnostic index of thyroid status in pregnancy and in oral contraception.

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Key concepts: Free thyroxine, Medicine, Thyroid function, Thyroid function tests, Internal medicine, Endocrinology, Thyroid, Thyroxine-binding proteins