Free thyroxine index or effective thyroxine ratio?

P R, Pannall

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South African Medica...arrow_drop_down

South African Medical Journal

Article . 1977

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Free thyroxine index or effective thyroxine ratio?

descriptionPublicationkeyboard_double_arrow_right Article 15 Apr 1977 English Journal:South African medical journal = Suid-Afrikaanse tydskrif vir geneeskunde, volume 51 (issn: 0256-9574,

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Authors: P R, Pannall;

pmid: 402701

Free thyroxine index or effective thyroxine ratio?

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Abstract

The ability of the free thyroxine index (FTI) and the effective thyroxine ratio (ETR) to distinguish abnormal from normal thyroid function is compared in a series of 422 patients; they were equally successful in detecting hyperthyroidism. In hypothyroidism, however, the ETR values of 22% were within 95% 'normal' limits compared with 7,4% of the FTI values. Other authors have shown a similar poorer sensitivity of the ETR compared with the FTI.

Keywords

Thyroxine, Thyroxine-Binding Proteins, Hypothyroidism, Humans, Thyroid Function Tests, Hyperthyroidism

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