Normal thyroid function values in Ethiopians.

Thyroid function values were determined in 56 healthy nongoitrous adult Ethiopians. The mean triiodothyronine (T3) values for 20 males and 36 females were 1.42 +/- 0.32 nmol/L and 1.51 +/- 0.25 nmol/L, and thyroxine (T4) values were 119 22 nmol/L and 116 +/- 21 nmol/L respectively. The mean thyrotropin (TSH) values for males and females were identical at 1.85 +/- 0.94 mu/L. Radioactive iodine uptake (RAIU) at 2 hours was 8.6 +/- 4.4% in males and 11.3 +/- 4.3% in females, and at 24 hours 31.7 +/- 11.7% and 38.9 +/- 11.1% respectively. The differences between males and females were significant at both 2 and 24 hours (P less than 0.05). The ranges for the 3 hormones derived from the mean 2SD values are close to those supplied with the kits but the Ethiopian RAIU values are higher than the values currently applicable in developed countries, probably indicative of the lower level of dietary iodine available to the population here. The values obtained in this study are offered to serve as normal reference for the interpretation of thyroid function results in Ethiopian patients. A strategy for the rational utilization of the available in vivo [corrected] tests is suggested.