Serum cortisol levels of 100 children 3-10 years old with various haemoglobinopathies were measured. The mean cortisol levels of sickle cell trait, sickle cell disease, beta-thalassemia minor and alpha 2-thalassemia were significantly (P < 0.05) lower than those of normal subjects. The decrease in cortisol levels varied from 25 (in the sickle cell trait group) to 57 per cent (in the alpha 2-thalassemia group) of the mean cortisol levels of the control group. These results suggest the presence of hypoadrenalism and its possible association with the indicated haemoglobinopathies.
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