Thyroid Medications in Pregnancy: How to Adjust Doses and Monitor TSH Levels
19.11.2025Thyroid medication doses must increase by 20-30% during pregnancy to support fetal brain development. TSH should be kept under 2.5 mIU/mL in the first trimester, with testing every 4 weeks. Levothyroxine is safe and essential - delaying adjustments can impact your child's IQ.