Asked in Blood Types
Blood Types

What are the 4 blood types?

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Wiki User
03/06/2015

Blood can be divided into various categories. 4 such categories are O+, O-, AB+, AB-.

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Wiki User
05/25/2009

There are four types of human blood, grouped into different catogories. Type 'A', 'B', 'AB' and type O. Each letter refers to a kind of protein or antigen, on the surface of the red blood cells. The surface of red blood cells in Type 'A' blood, has antigens known as A-antigens. Type 'B' blood is determined by it's lack of antigens, which are carried to the surface of red blood cells. Type AB blood is considered the universal recipient because people with this type can receive any blood type. Type O blood is considered the "universal donor" because it can be donated to people of any blood type. Antigens: An antigen is a substance that prompts the generation of antibodies and can cause an immune response