title: Free thyroxine index or effective thyroxine ratio?
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.
mesh_terms: D006801:Humans; D006980:Hyperthyroidism / Q000097:blood / Q000175:diagnosis*; D007037:Hypothyroidism / Q000097:blood / Q000175:diagnosis*; D013960:Thyroid Function Tests; D013974:Thyroxine / Q000097:blood*; D013975:Thyroxine-Binding Proteins
chemical_list: D013975:Thyroxine-Binding Proteins; D013974:Thyroxine