RESUMO
The estimation of triiodothyronine T[3], thyroxine T[4], free thyroxine index [FTI] levels in 243 euthyroid and 129 hyperthyroid individuals between the ages of 18-60 years from southern Iraq. The study included both males and females. Wayne's Index was used for establishing the diagnosis of hyperthyroidism. Twenty-two selected hyperthyroid cases with FTI values of normal range were shown to be cases of T[3] thyrotoxicosis. On the basis of our study we recommend that Wayne's scoring index should be used for the diagnosis of hyperthyroidism, clinically, especially when supportive laboratory investigation are not satisfactory. This appears reliable, since the convenient laboratory tests for estimation of FTI levels supported, and was found commensurate with the diagnosis of hyperthyroidism in only 82% of our cases