Explore Blood Group Systems
Discover all 44 officially recognized blood group systems and the hundreds of antigens that make each one unique. Data sourced in real-time from the ISBT Blood Group Database.
Why This Matters
Beyond ABO and Rh, these blood group systems become critical for patients who receive multiple transfusions, pregnant women, and anyone who develops antibodies to other blood group antigens.
Multiple Systems
Each blood group system is defined by a gene or gene complex that produces specific antigens on red blood cells.
Clinical Significance
Some antigens are highly immunogenic and can cause transfusion reactions or hemolytic disease of the newborn.
Genetic Diversity
Antigen frequencies vary by population, making blood donor diversity essential for finding compatible blood.
Explore Blood Group Systems
Click any system to see its antigens. Data from the ISBT Blood Group Database.
Discovery years are approximate based on historical literature. Data source: ISBT Blood Group Database
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