![]() ![]() Having Rh incompatibility can set the stage for problems, particularly if you’re planning on having more children later on. Trusted Source Mayo Clinic Rh factor blood test See All Sources Why is Rh factor testing important during pregnancy? But they could be dangerous later on if you become pregnant with another Rh positive baby. At that point, the antibodies your body makes cannot harm your baby. It may sound scary, but Rh incompatibility only becomes a problem if you and your baby’s blood mix, most likely during birth. That can potentially cause a serious type of anemia and other health problems. Since red blood cells carry oxygen, this type of attack can make it hard for a baby to get the amount of oxygen she needs. If the baby’s Rh positive blood cells enter the mother's circulation, her immune system may view them as "foreign" - and, in a normal immune response, mobilize armies of antibodies to attack these unfamiliar cells. Rh incompatibility is when a mom is Rh negative and her baby is Rh positive, which can cause problems during pregnancy. Whether you’re Rh positive or negative doesn’t matter much, except when it comes to pregnancy. Trusted Source Merck Manual Hemolytic Disease of the Fetus and Newborn See All Sources ![]() In Asian people, the chances of being Rh negative are only around 0.3 percent. Negative Rh factor occurs in around 15 percent of white people and between 4 and 8 percent of Black people. Trusted Source KidsHealth From Nemours Rh Incompatibility During Pregnancy See All Sources But not everyone has it. If you carry the protein, you’re Rh positive. If you don’t, you’re Rh negative. Rh factor is a type of protein often found on red blood cells, which carry oxygen throughout the body. Here’s what you need to know about Rh factor testing, how the test works and what it means for your pregnancy if you’re Rh negative. ![]()
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