Three hundred and two pregnant women participated in this study. Our results showed that the range, mean and median urinary iodine excretion (UIE) were 28.1 to 218.1, 152.09 ± 41.65 and 163.1 µg/l, respectively. The range, mean and median TSH concentration were 0.7 - 5.9, 1.4 ± 0.7 and 1.3 µIU/ml, respectively. Our results showed that none of the women have severe iodine deficiency, 2% had moderate iodine deficiency, 12% had mild iodine deficiency, while 80% had optimal iodine nutrition and 6% have more than adequate. We observed a progressive and significant (P = 0.0009) decrease in the mean UIE from the 1st to the 3rd trimester. We observed also that 95% of the pregnant women had TSH concentration within the normal range. The TSH values between the three trimesters showed no significant difference (P = 1.20). The Urinary Iodine Excretion and Thyroid Stimulating Hormone concentration values suggest that iodine deficiency has been eliminated as a public health problem in Orlu. The progressive decrease in the median UIE from the 1st to the 3rd trimester should be addressed to meet the increased demand of iodine as a result of the pregnancy.
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