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The B blood group is one of the four major types within the ABO blood group system, which classifies human blood based on specific antigens present on the surface of red blood cells (RBCs) and corresponding antibodies found in the plasma. Blood groups and pregnancy A blood group test is always done on pregnant women. If the mother is rhesus negative and the unborn baby is rhesus positive (inherited from a rhesus positive father) then the mother's immune system may produce anti-rhesus antibodies. These may attack and destroy the baby's blood cells. Discover 42 fascinating facts about the B positive blood type, including its characteristics, health implications, and compatibility with other blood types. Not all blood is alike. Learn about blood typing and the rarest and most common types of blood and how they can impact your blood donation.