When hypothyroidism is newly discovered during pregnancy, we suggest initiating the treatment with the following LT4 doses: 1.20 μg/kg/day for SCH with TSH ≤ 4.2 mIU/L, 1.42 μg/kg/day with TSH > 4.2-10, and 2.33 μg/kg/day for OH. By taking this approach, patients will promptly attain the euthyroid state avoiding additional increments and, probably, obstetric risks.
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