The variants allowed them to pinpoint the source of the GDF15 increase. They discovered it was overwhelmingly coming from the fetal part of the placenta ... higher-than-normal levels of ...
TSH, which declines in the first trimester of pregnancy and returns to normal in the second, does not cross the placenta. Normal is 0.5-5.0mcU/mL. hCG - Human chorionic gonadotropin (hCG ...
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