Given those findings, Dr. Mestman recommended that pregnant, antibody-positive euthyroid women should be treated. The treatment should include a prenatal vitamin with 150 mcg of iodine. They should have TSH and T4 levels monitored every 4–6 weeks during the first 20 weeks of pregnancy. After 20 weeks, they should have their TSH and T4 measured once at 28 weeks and should take 50–75 mcg a day of levothyroxine. If the patient is already on levothyroxine, the dose should be increased by 25 mcg.