Doppler ultrasound, to check blood flow to the baby's brain.Regular blood tests, to check the level of antibodies in your blood.If you are Rh-sensitized, your doctor will watch your pregnancy carefully. If the newborn has Rh-positive blood, you will have an antibody test to see if you were sensitized during late pregnancy or childbirth. Your baby will have a blood test at birth.(You might need to have the test again if you have an amniocentesis, if your pregnancy goes beyond 40 weeks, or if you have a problem such as placenta abruptio, which could cause bleeding in the uterus.) If the test still shows that you are not sensitized, you probably will not need another antibody test until delivery. The blood test may be repeated between 24 and 28 weeks of pregnancy.If you have Rh-negative blood but are not sensitized: This test will show if you have Rh-negative blood and if you are Rh-sensitized. How is Rh sensitization diagnosed?Īll pregnant women get a blood test at their first prenatal visit during early pregnancy. If you have Rh-negative blood, your doctor will probably treat you as though the baby's blood is Rh-positive no matter what the father's blood type is, just to be on the safe side. Since the mother's blood and the baby's blood match, sensitization will not occur. If both parents have Rh-negative blood, the baby will have Rh-negative blood.If the mother is Rh-negative and the father is Rh-positive, there is a good chance the baby will have Rh-positive blood.Rh sensitization during pregnancy can only happen if a woman has Rh-negative blood and only if her baby has Rh-positive blood. Who gets Rh sensitization during pregnancy? If you are already sensitized, treatment can help protect your baby.If you are at risk, Rh sensitization can almost always be prevented.It doesn't cause any warning symptoms, and a blood test is the only way to know you have it or are at risk for it. Rh sensitization is one reason it's important to see your doctor in the first trimester of pregnancy. The problems will tend to get worse with each Rh-positive pregnancy you have. This can cause the baby to have anemia, jaundice, or more serious problems.
It takes a while to make antibodies that can affect the baby, so during your first pregnancy, the baby probably would not be affected.īut if you get pregnant again with an Rh-positive baby, the antibodies already in your blood could attack the baby's red blood cells. In most cases, your blood will not mix with your baby's blood until delivery. Rh sensitization can occur during pregnancy if you are Rh-negative and pregnant with a developing baby ( fetus) who has Rh-positive blood. What causes Rh sensitization during pregnancy? This immune system response is called Rh sensitization. If your blood mixes with Rh-positive blood, your immune system will react to the Rh factor by making antibodies to destroy it. If you are Rh-negative, your red blood cells do not have a marker called Rh factor on them. Topic Overview What is Rh sensitization during pregnancy?
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