Blood typing is a common test when blood transfusions and tissue transplants are required, as well as during pregnancy.
A blood type lab test identifies certain inherited substances (antigens) that may be present on the surface of red blood cells and classifies them into four common groups: A, B, AB, or O, and is known as the ABO system.
In addition, a second system, the Rh system, determines if the red blood cells are Rh-positive or Rh-negative.
You are Rh-positive when you have the Rh factor. It is important to know both the ABO and Rh types in that a mismatch is capable of inducing an intense immunogenic reaction that can be fatal.
Your blood type is determined based on specific antigens present in your blood.
You can find out your blood type by performing a test, donating blood, or taking an at-home blood test.
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