|
The various ABO blood groups occur in the average population of the US in the proportions shown here. 45% of the population are type O, 42% type A, 10% type B and 3% type AB. These percentages vary within different ethnic groups. In addition there is another type antigen to be considered. The Rh antigen.
Those who have the Rh antigen on their red cells are typed Rh positive while those without it are Rh negative. Thus, when matching blood, we must consider both the ABO system and the Rh types. For example, if you have both the A antigen and the Rh antigen on your red cells, you are A+.
|
|
|
