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Mild Thyroid Deficiency Can Cause Serious Problems in Pregnancy

  • May 11, 2004

Whether to test every pregnant woman's blood for thyroid deficiency is controversial, yet even a mildly underactive thyroid--too mild to cause symptoms--may cause serious problems during pregnancy, such as premature birth or babies born with lower IQs. A sluggish thyroid can also cause a miscarriage. Obstetricians say there isn't enough evidence yet to warrant testing all 4-million-plus pregnant women each year to find the roughly 2.5 percent thought to have asymptomatic hypothyroidism. But...