If you are a type A, it means that the liquid portion of your blood, called the plasma, contains antibodies against type B blood. If you are a type B, it means that your plasma contains antibodies against type A blood. If you are neither type A or B, you are type O, which means that your plasma contains antibodies against both type A and type B blood. Type O-negative blood does not have any antigens. It is called the "universal donor" type because it is compatible with any blood type. And if you have type AB blood, your plasma does not contain antibodies against either type A or type B blood. Type AB-positive blood is called the "universal recipient" type because a person who has it can receive blood of any type.
Rh blood type checks for the presence (+) or absence (–) of the Rh antigen, also called the Rh factor. If your red blood cells contain the Rh antigen, your blood is Rh-positive, while if your red blood cells do not contain the Rh antigen, your blood is Rh-negative.
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