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Erythroblastosis fetalis, photomicrograph
Erythroblastosis fetalis, photomicrograph


Blood typing

Alternative Names:
Cross matching; Rh typing; ABO blood typing
Text Continues Below



Normal Values:
  • Forward typing:
    • If your blood cells stick together when mixed with anti-A serum, you have type A blood.
    • If your blood cells stick together when mixed with anti-B serum, you have type B blood.
    • If your blood cells stick together when they are mixed with both anti-A and anti-B serums, you have type AB blood.
    • If your blood cells do not stick together in the presence of either serum, you have type O blood.
    • If your blood cells stick together when mixed with anti-Rh serum, you have type Rh-positive blood.
    • If your blood does not clot when mixed with anti-Rh serum, you have type Rh-negative blood.
  • Reverse typing:
    • Blood cell stickiness that occurs when B cells are mixed with your serum indicates you have type A blood.
    • Blood cell stickiness that occurs when A cells are mixed with your serum indicates you have type B blood.
    • Blood cell stickiness that occurs when your serum is mixed with both types of cells indicates you have type O blood.
    • Lack of blood cells sticking together when your serum is mixed with both types of blood indicates you have type AB blood.
  • Transfusions:
    • If you have type A blood, you can receive blood transfusions from people with types A and O blood.
    • If you have type B blood, you can receive blood transfusions from people with types B and O blood.
    • If you have type AB blood, you can receive blood transfusions from people with types A, B, AB, and O blood.
    • If you have type O blood, you can receive blood transfusions from people with type O blood only.
    • If you have Rh-positive blood, you can receive transfusions from people with types Rh-positive and Rh-negative blood.
    • If you have Rh-negative blood, you can receive transfusions from people with type Rh-negative blood only.

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