It isn't: In the case of rh disease, it is the mother that is sensitized. The fetus is at risk for anemia due to maternal anti-rhesus antibody crossing the placenta. If the fetus is rh negative, there will be no problem. The blood type of the fetus isnot usually determined until after delivery. There is research into determining fetal blood type from mom's blood - but that is not yet available.
Answered 2/27/2014
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