8/11/2004

Low levels of thyroid hormone, which regulates metabolism, have long been associated with congenital abnormalities, but researchers now say having too much thyroid hormone may be just as dangerous to a fetus. The findings are significant in light of a recent study suggesting that women treated for underactive thyroid who become pregnant should increase their dose thyroid hormone by 29%, and experts in the new study say hormonal replacement must be fine-tuned to prevent exceeding normal requirements.

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