If an Rh-negative mother carries an Rh-positive baby, there is a risk that the mother's immune system will be exposed to the baby's blood cells, usually during delivery or certain prenatal events. In subsequent pregnancies, these antibodies can cross the placenta and attack the red blood cells of an Rh-positive fetus, leading to a condition known as hemolytic disease of the newborn (HDN).
Understanding Rh Positive Blood Type Immune Reaction
The Impact on Pregnancy Perhaps the most significant concern regarding the Rh factor arises in pregnancy. If the baby is Rh-positive, the mother receives an injection of Rh immunoglobulin (RhIg), commonly known as RhoGAM.
Defining the Rh Factor The term "Rh factor" refers to the Rhesus antigen, a specific protein that can exist on the surface of red blood cells. The rarity of negative types, combined with the universal need for compatible blood, underscores the importance of widespread donor screening.
Understanding Rh Positive Blood Type Immune Reaction
The name originates from the Rhesus monkey, as the antigen was first identified in these animals during the 1940s. If an Rh-negative individual receives Rh-positive blood, their immune system will recognize the protein as a foreign invader.
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