Abstract
Hypothyroidism negatively impacts fertility, early pregnancy and fetal development. Thyroid requirements increase in pregnancy. Recent guidelines have recommended that women with a history of infertility or miscarriage be treated with L-thyroxine (T4) if their TSH ≥ 2.5 μIU/mL before or during pregnancy. This study sought to determine the prevalence of mild hypothyroidism in very early pregnancy in previously euthyroid women.
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