Thyroid function during pregnancy in women with past Graves' disease.

Graves' disease and thyroid dysfunction during pregnancy can lead to maternal and fetal complications. No information is available on thyroid function in women with a past history of Graves' disease. We compared free T3, free T4 and TSH in a group of pregnant women with a history of resolved Graves' disease requiring no current treatment (n= 34) and in a group of pregnant controls (n= 102). We found no significant differences in the levels of these hormones between the two groups. Women with a past history of Graves' disease and no current treatment display a normal thyroid function and adaptation during pregnancy.