The dose of levothyroxine in the hypothyroid patient who becomes pregnant usually needs to be increased by 30-50% in most cases.
Reasons for increase in requirement
Reasons for increase in requirement
- Increased serum concentration of Thyroxine-Binding Globulin induced by estrogen
- Expression of type 3 deiodinase by the placenta
- Small amount of transplacental passage of levothyroxine from mother to fetus
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