For women who were previously on thyroxine, the requirement in pregnancy is 30%â50% more than that of the preconception dosage. Patients must be followed up 4â6 weeks after initiation of treatment, with the goal of therapy to titrate serum
TSH levels below 2.5 mIU/L while maintaining free T4 levels in the high-normal range.
To maintain the level below 2.5ml/l your doctor may increase the dose which is justified.
hypothyroidism in pregnancy is an easily treatable condition that is associated with significant risk to the fetus: low birth weight, fetal distress, and impaired neuropsychological development.