Thyroid Disease in Pregnancy
Thyroid disease is the 2nd most common endocrine disorder that affects women of childbearing age. Hyperthyroidism occurs in 0.2% of pregnancies. Hypothyroidism occurs in 2.5% of pregnancies. Postpartum thyroid disease occurs in 5-10% of women after delivery who don’t have history of thyroid disease. 25% of women with Type 1 DM develop postpartum thyroid dysfunction. Incidence of thyroid cancer in pregnancy is 1 per 1000. Malignancy is found in up to 5-40% of thyroid nodules discovered during pregnancy.
Radioactive Iodine Therapy
Adequate radioactive iodine treatment will result in complete or near complete elimination of the thyroid gland (this is what we want it to do). The treatment usually takes approximately 3 months to be completely effective. The treatment is effective in 90% of patients. In 10% of patients, overproduction of thyroid hormone may persist. For these patients, a second treatment with radioactive iodine may be needed in 6-9 months.