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Hypothyroidism is common in pregnancy with an estimated prevalence of 2-3% and 0.3-0.5% for subclinical and overt hypothyroidism respectively. [8] Endemic iodine deficiency accounts for most hypothyroidism in pregnant women worldwide while chronic autoimmune thyroiditis is the most common cause of hypothyroidism in iodine sufficient parts of the world.
Universal screening for thyroid diseases during pregnancy is controversial, however, one study "supports the potential benefit of universal screening". [131] Pregnant women may have anti-thyroid antibodies (5%–14% of pregnancies [15]), poor thyroid function resulting in hypothyroidism, or both. Each is associated with risks.
Some risk factors include antithyroid antibodies, type 1 diabetes, history of thyroid problems, and family history of thyroid problems. According to the National Institute of Health, postpartum thyroiditis is especially common in Pakistan because it is an iodine-deficient country. [citation needed]
Antithyroid autoantibodies (or simply antithyroid antibodies) are autoantibodies targeted against one or more components on the thyroid.The most clinically relevant anti-thyroid autoantibodies are anti-thyroid peroxidase antibodies (anti-TPO antibodies, TPOAb), thyrotropin receptor antibodies (TRAb) and thyroglobulin antibodies (TgAb).
One study showed infants born to treated hypothyroid mothers had abnormal thyroid function compared to matched controls. [2] Therefore, it is advised to monitor T4 levels throughout the pregnancy in case treatment dosages should be increased to accommodate both the mother’s and fetus’s thyroid hormone requirements.
Radioiodine uptake by the thyroid, thyroid scan, and measurement of antithyroid autoantibodies (thyroidal thyrotropin receptor antibodies are positive in Graves disease) may help determine the cause. [1] Treatment depends partly on the cause and severity of disease. [1]
Symptoms of normal pregnancy, like fatigue, can make it easy to overlook thyroid problems in pregnancy. [1] Thyroid hormone is vital during pregnancy. The unborn baby's brain and nervous system need thyroid hormone to develop. During the first trimester, the baby depends on the mother's supply of thyroid hormone. At 10 to 12 weeks of pregnancy ...
Other examples of insufficient immune tolerance in pregnancy are Rh disease and pre-eclampsia: Rh disease is caused by the mother producing antibodies (including IgG antibodies) against the Rhesus D antigen on their baby's red blood cells. It occurs if the mother is Rh negative and the baby is Rh positive, and a small amount of Rh positive ...