In infertile women with subclinical hypothyroidism, with or without thyroid peroxidase antibodies, serum TSH during pregnancy follows preconception values and thyroid hormones remain stable.

The serum TSH levels of the pregnant women with preconception serum TSH levels between 0.3 and 2.5 mIU/l and with anti-TPO antibody levels ≤100 IU/ml decreased during early pregnancy, but the differences did not reach statistical significance ( Fig. 5 ).

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