Rhesus blood group system refers to the five main Rhesus antigens (C, c, D, E and e) on the surface of red blood cells. People who are Rhesus positive have a protein known as D antigen on the surface of their red blood cells, and they are classified as RhD positive. People who do not have the D antigen are known as RhD negative. Your rhesus status is important if you are undergoing an abortion, because if you are RhD negative, you will require further treatment to prevent antibodies from developing in your body.

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