The main risk of a blood transfusion is that the wrong blood type may be accidentally given. This happens about once in every 14,000 transfusions. Transfusion with the wrong blood type can result in a severe, sometimes life-threatening reaction.
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What are blood types, and why are they important?
Your blood type indicates specific markers (
[Only Registered users can see links . Click Here To Register...]) found on the red blood cells and in the plasma. These markers allow your body to recognize your blood as its own. If a different blood type is introduced, your
[Only Registered users can see links . Click Here To Register...] recognizes it as foreign and attacks it, resulting in a transfusion reaction. A mild transfusion reaction is rarely life-threatening when treated quickly. A severe transfusion reaction can be life-threatening.
The most important blood type classification systems are the ABO system and the Rh system. The ABO system consists of A, B, AB, and O blood types. People with type AB blood are called universal recipients because they can receive any of the ABO types. People with type O blood are called universal donors because their blood can be given to people with any of the ABO types. Each type of blood in the ABO system has a positive or negative
[Only Registered users can see links . Click Here To Register...]. For example, if you have "A+ blood," it means your blood is type A (in the ABO system) and your Rh factor is positive.
There are over 100 other minor blood subtypes, which may sometimes cause minor transfusion reactions but rarely cause serious reactions.