Patient's question:
During pregnancy, it is always particularly uncomfortable, and morning sickness is also very severe. Does hypothyroidism affect the fetus?Doctor's answer:
Because fetal development requires FT4 (FT3 does not cross the placenta), it is necessary to ensure the fetus has sufficient FT4. Currently, FT4 should be slightly above the midline. However, FT4 measurements have a large margin of error, so TSH is used for correction. A TSH level below 2.5 generally indicates sufficient FT4. Of course, this is not absolute. As long as FT4 is sufficient, TSH levels around 2.5 should still be considered normal.