There are 8 blood types. Blood can either be A, B, O, or AB. Then each blood type has a Rh factor. This can either be positive or negative. O negative is the universal donor and AB- is the universal receiver.
There are 4: A, B, AB, and O. Individuals with blood type A only have the A antigen (chemical substances that can be targeted by one’s immune system) in their blood, while individuals with blood type B only have the B antigen in their blood stream, AB blood type indicates that the individual has both, and O has neither. This affects whether an individual can give blood because blood type A and B are not compatible–however, individuals with blood type AB can receive both A and B blood– and O blood can be donated to an individual with any type of blood (universal donor.)
There are four blood types. A, B, AB, and O. the letters stand for antigens present in the blood.
Antigens are compounds that are targeted by the immune system. If the immune system detects a foreign antigen, it will develop antibodies that bind to the antigen, flagging it for destruction by macrophages (white blood cells). This is important when considering blood transfusions. People with blood type A possess only A antigens, so if the receive type B or AB blood, their body will attack it, because it won’t recognize the B antigens. Type B people will reject transfusions from type A and type AB people for the same reasons. AB people can accept blood from anybody because they naturally possess both antigens. Type O people are considered “universal donors” because they have no antigens in their blood that might be recognized and targeted by other people’s immune systems. But, they can also only accept blood from other type Os.
In addition to the A, B, AB, and O blood types. Blood groups are categorized as either Rh positive or Rh negative. In this way, it can be said there are 8 different blood types A+, A-, AB+, AB-, B+, B-, O+, and O-. Rh positive people have an antigen “D” that Rh negative people do not have. In an ideal blood tranfusion, the donor will have the same Rh status as the person receiving blood. This is also important to think about during pregnancy. If a mother is Rh-, and her baby is Rh+, her body can mount an immune response against her baby. Nowadays, doctors can give mothers drugs to suppress this immune reaction.
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