If you're Rh negative and your baby is Rh positive, your body could make antibodies that might be harmful during another pregnancy. If you're Rh positive, you don't need to do anything. The blood sample usually is taken during the first prenatal visit and sent to a lab for testing. Mother's Rh factorĪn Rh factor test is a basic blood test. The baby might be given a blood transfusion through the umbilical cord during pregnancy or immediately after delivery if necessary. Your baby will be carefully monitored during your pregnancy. If the antibody screen shows that you're already producing antibodies, an injection of Rh immune globulin won't help.
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