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Rh incompatibility - OBGYN Associates
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Our Health Library information does not replace the advice of a doctor. Please be advised that this information is made available to assist our patients to learn more about their health. Our providers may not see and/or treat all topics found herein.

Rh incompatibility

People without Rh factor on the surface of their blood cells are Rh-negative and have Rh incompatibility with blood that is Rh-positive. This incompatibility means that when exposed to Rh-positive blood, the immune systems of people with Rh-negative blood produce antibodies that cause Rh-positive blood cells to be destroyed.

Pregnancy and blood transfusions are the two most common ways that a person with Rh-negative blood can be exposed to Rh-positive blood.

In a woman with Rh-negative blood who has been exposed at least once to Rh factor (usually from a previous pregnancy), this immune system response can cause serious problems during a future pregnancy if the fetus has Rh-positive blood. The mother's immune system produces Rh antibodies that cross the placenta and attack the fetal blood cells. This can be prevented by giving the mother an injection of antibodies, called RhoGAM.

People requiring blood transfusions have Rh testing and are given only compatible blood.

Current as of: April 30, 2024

Author: Ignite Healthwise, LLC Staff

Clinical Review Board
All Healthwise education is reviewed by a team that includes physicians, nurses, advanced practitioners, registered dieticians, and other healthcare professionals.