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There are four major blood types: A, B, O, and AB. The types are based on substances on the surface of the blood cells. Another blood type is called Rh. Rh factor is a protein on red blood cells. Most people are Rh-positive; they have Rh factor. Rh-negative people don't have it. Rh factor is inherited though genes.

When you're pregnant, blood from your baby can cross into your bloodstream, especially during delivery. If you're Rh-negative and your baby is Rh-positive, your body will react to the baby's blood as a foreign substance. It will create antibodies (proteins) against the baby's blood. These antibodies usually don't cause problems during a first pregnancy.

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Photograph of a pregnant woman in the hospital
Results 1 - 10 of 43 for rh incompatibility
  1. Rh Incompatibility (National Library of Medicine)  
    ... t cause problems during a first pregnancy. But Rh incompatibility may cause problems in later pregnancies, if the ... Rh antibodies. It helps prevent the problems of Rh incompatibility. If treatment is needed for the baby, it ...
  2. How Is Rh Incompatibility Treated? (National Heart, Lung, and Blood Institute)  
    ... page from the NHLBI on Twitter. How Is Rh Incompatibility Treated? Rh incompatibility is treated with a medicine ... for the condition in future pregnancies. Treatment for Rh Incompatibility If Rh incompatibility is diagnosed during your pregnancy, ...
  3. Rh Incompatibility From the National Institutes of Health (National Heart, Lung, and Blood Institute)  
    ... page from the NHLBI on Twitter. What Is Rh Incompatibility? Rh incompatibility is a condition that occurs during pregnancy if ... in your body once they have formed. Thus, Rh incompatibility is more likely to cause problems in second ...
  4. Rh incompatibility is a condition that develops when a pregnant woman has Rh-negative blood and the baby ... who are also Rh-positive may be affected. Rh incompatibility develops only when the mother is Rh-negative ...
  5. Rh Incompatibility (For Parents) (Nemours Foundation)  
    ... and Rh-positive father will be Rh positive. Rh incompatibility usually isn't a problem if it's the ... Rh Disease of the Newborn In generations past, Rh incompatibility was a very serious problem. Fortunately, significant medical ...
  6. Rh incompatibility occurs when the mother's blood type is Rh negative and her fetus' blood type is Rh positive.
  7. Rh Factor: How It Can Affect Your Pregnancy (American College of Obstetricians and Gynecologists) - PDF  
    ... a later pregnancy. What happens if there is Rh incompatibility during pregnancy? When an Rh-negative mother’s blood ... problems during pregnancy? • What happens if there is Rh incompatibility during pregnancy? • How does Rh sensitization occur during ...
  8. Cerebral Palsy -- Hope through Research From the National Institutes of Health (National Institute of Neurological Disorders and Stroke)  
    ... quadriplegia — paralysis of both the arms and legs. Rh incompatibility — a blood condition in which antibodies in a ...
  9. Blood Typing (American Association for Clinical Chemistry)  
    ... women are tested to determine the risk of Rh incompatibility between the mother and fetus Sample Required? A ... a hemolytic transfusion reaction due to ABO or Rh incompatibility. A universal recipient is a person who has ...
  10. ... is a complication of a severe form of Rh incompatibility . This is a condition in which mother who ... blood cells, and the antibodies cross the placenta. Rh incompatibility causes a large number of red blood cells ...
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