from Section 1 - Medicine
Published online by Cambridge University Press: 26 May 2025
Blood groups result from different antigens expressed on the surface of red blood cells (RBCs). There are a number of different blood group antigens, and those produced by the same gene are called a blood group system. Two of the most important blood group systems are the ABO system and the Rhesus (Rh) system as these are the main systems responsible for transfusion compatibility. However, these are only 2 of 29 blood group systems which have currently been identified. Examples of other systems are the Kell, Kidd, Lutheran and Duffy systems. The importance of these other blood groups systems should not be underestimated.
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