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What are the human blood types?

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The human body naturally makes antibodies that will attack certain types of red-blood-cell antigens. For example, people with type A blood have A antigens on their red blood cells and make antibodies that attack B antigens; people with type B blood have B antigens on their red blood cells and make antibodies that attack A antigens. read more

A blood type (also called a blood group) is a classification of blood based on the presence and absence of antibodies and also based on the presence or absence of inherited antigenic substances on the surface of red blood cells (RBCs). read more

If you don't know, you should be tested (for emergency purposes, when you may need the blood right away, and there is no "Universal Donor" blood available). Compare your ABO blood group with the others on the chart. read more

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Source: scienceabc.com