Does high thyroxine in pregnancy have any effect on the child, if it is slightly high due to pregnancy, it usually has no effect, if you have hyperthyroidism it does.
The term high thyroxine in pregnancy is more generalized, as pregnancy itself can affect thyroxine levels. Total triiodothyronine and total tetraiodothyronine may also be slightly elevated if tested during pregnancy, which is normal and does not affect the fetus.
If tri-iodothyronine and tetra-iodothyronine are above normal, free tri-iodothyronine and free tetra-iodothyronine are also high, and thyroid stimulating hormone is significantly lower. Then, hyperthyroidism can be considered, which will affect the health of the fetus, and premature labor, miscarriage, and malformations can occur.
Pregnant women are usually advised to adjust their diet throughout pregnancy to avoid foods high in iodine, such as iodized salt, nori, and kelp.