WASHINGTON - Pressure is increasing for science to settle a long-running controversy about mild thyroid problems and pregnancy.
Numerous studies since 1999 have found that an underactive thyroid can raise a woman's risk of miscarriage, premature birth, or a lower IQ for her baby.
The problem is that while serious cases are treated with a hormone pill, so far there's little evidence that treating the milder cases makes a difference.
Researchers at Quest Diagnostics recently examined records for half a million pregnant women. Of those who got tested, a higher-than-expected number - 15 percent - had an underactive thyroid, mostly mild cases. But that's five-fold higher than some previous estimates. The study is in the Journal of Clinical Endocrinology & Metabolism.
A well-known endocrinologist at Boston Medical Center says she would treat an underactive thyroid "every time."
But obstetricians seem more wary, noting there are conflicting studies about mild problems.
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