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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 45 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. Who Is at Risk for Rh Incompatibility? From the National Institutes of Health (National Heart, Lung, and Blood Institute)  
    ... NHLBI on Twitter. Who Is at Risk for Rh Incompatibility? An Rh-negative woman who conceives a child ... an Rh-positive man is at risk for Rh incompatibility. Rh factor is inherited (passed from parents to ...
  5. Living with Rh Incompatibility From the National Institutes of Health (National Heart, Lung, and Blood Institute)  
    ... page from the NHLBI on Twitter. Living With Rh Incompatibility If you have Rh-negative blood, injections of Rh immune globulin can reduce your risk of Rh incompatibility in future pregnancies. It's important to get this ...
  6. Rh Incompatibility (For Parents) (Nemours Foundation)  
    ... Free Health Lessons Social Media: Connect With Us Rh Incompatibility KidsHealth > Parents > Pregnancy & Newborn Center > Your Pregnancy > Rh Incompatibility Print A A A Text Size What's in ...
  7. What Are the Signs and Symptoms of Rh Incompatibility? From the National Institutes of Health (National Heart, Lung, and Blood Institute)  
    ... Twitter. What Are the Signs and Symptoms of Rh Incompatibility? Rh incompatibility doesn't cause signs or symptoms in a ... after. Rate This Content: Next >> January 1, 2011 Rh Incompatibility Clinical Trials Clinical trials are research studies that ...
  8. 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 ...
  9. Rh incompatibility occurs when the mother's blood type is Rh negative and her fetus' blood type is Rh positive.
  10. How Is Rh Compatibility Diagnosed? From the National Institutes of Health (National Heart, Lung, and Blood Institute)  
    ... page from the NHLBI on Twitter. How Is Rh Incompatibility Diagnosed? Rh incompatibility is diagnosed with blood tests . To find out ... ultrasound. Specialists Involved An obstetrician will screen for Rh incompatibility. This is a doctor who specializes in treating ...
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