This can occur if an Rh-negative woman has once had:Ī simple blood test during pregnancy will identify Rh factor. In most cases the condition becomes worse in later pregnancies.Ī woman can be sensitized any time Rh-positive blood mixes with her blood. In a second pregnancy with a Rh-positive fetus, these antibodies are more likely to cause anemia in the fetus. In a first pregnancy with a Rh-positive fetus the baby is often born before the antibodies develop, so there may be no serious problems. These antibodies once formed do not go away. This causes anemia which can lead to a serious illness, brain damage or even death of the fetus or newborn. The mother becomes sensitized and makes antibodies that break down the fetal red blood cells. When this happens a small number of women with Rh-negative blood who carry a Rh-positive fetus will react as if they are were allergic to the fetus. However, a small amount of blood from the fetus can cross the placenta into the women’s systems. This means they produce antibodies that fight the Rh factor as if it were a harmful substance.ĭuring pregnancy, the woman and fetus do not share blood systems. If this happens, the person with Rh-negative blood may become sensitized. The Rh factor causes problems when a Rh-negative person’s blood comes in contact with Rh-positive blood. In most cases, these problems can be prevented by taking special medications. The Rh factor does not affect a person’s overall health. A simple blood test during pregnancy will determine if you are Rh-positive or Rh-negative. Others do not have the Rh factor and are considered Rh-negative. Most individuals have the Rh factor and are consider Rh-positive. The Rh factor is the type of protein found on the red blood cells.
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