Abstract
Disorders of the thyroid in women are common during the reproductive years. Incorrect or delayed treatment during pregnancy can adversely affect the health of mother and child. Knowledge of the physiological changes during this time is essential. Thyroid disorders, in particular hypothyroidism, may compromise fertility. Autoimmune thyroiditis is associated with a higher risk of fetal loss. In women on thyroid hormone replacement therapy, the thyroxine dose has to be adjusted to meet the enhanced requirement during pregnancy. Thyroid hormone is vital to fetal brain development. During pregnancy and lactation, iodine supplementation is also recommended due to alterations in iodine metabolism. Hyperthyroidism during pregnancy can adversely affect pregnancy outcome and has to be treated accordingly. Propylthiouracil should be given using the least effective dose to keep free thyroxine levels at the upper limit of normal or slightly above. Hyperthyroidism in the fetus and the neonate can be induced by thyroid stimulating antibodies capable of passing the placenta.
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