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Most Needed Blood

There are four major blood groups determined by the presence or absence of two antigens – A and B – on the surface of red blood cells:

  • Group A – has only the A antigen on red cells (and B antibody in the plasma)
  • Group B – has only the B antigen on red cells (and A antibody in the plasma)
  • Group AB – has both A and B antigens on red cells (but neither A nor B antibody in the plasma)
  • Group O – has neither A nor B antigens on red cells (but both A and B antibody are in the plasma)
There are very specific ways in which blood types must be matched for a safe transfusion: 
 
Blood type chart
Group O O Blood Type diagram linking blood types O Blood Type
A can donate red blood cells to A's and AB's A Blood Type A Blood Type
B can donate red blood cells to B's and AB's B Blood Type B Blood Type
Group AB can donate to other AB's but can receive from all others AB Blood Type AB Blood Type
 

In addition to the A and B antigens, there is a third antigen called the Rh factor, which can be either present (+) or absent ( – ). In general, Rh negative blood is given to Rh-negative patients, and Rh positive blood or Rh negative blood may be given to Rh positive patients.

The universal red cell donor has Type O negative blood type.

The universal plasma donor has Type AB positive blood type.

  • It’s inherited. Like eye color, blood type is passed genetically from your parents. Whether your blood group is type A, B, AB or O is based on the blood types of your mother and father.
     
    This chart shows the potential blood types you may inherit. 
      Parent 1 AB AB AB AB B A A O O O
    Parent 2 AB B A O B B A B A O
    Possible
    blood
    type
    of
    child
    O         X X X X X X
    A X X X X   X X   X  
    B X X X X X X   X    
    AB X X X     X        

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