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Blood typing   

Overview | Risks | Results

Alternative names:

Cross matching; Rh typing; ABO blood typing

Normal Values

• Forward typing:
  • If your blood cells stick together when mixed with anti-A serum, then you have type A blood.
  • If your blood cells stick together when mixed with anti-B serum, then you have type B blood.
  • If your blood cells stick together when they are mixed with both anti-A and anti-B serums, then you have type AB blood.
  • If your blood cells do not stick together in the presence of either serum, then you have type O blood.
  • If your blood cells stick together when mixed with anti-Rh serum, then you have type Rh-positive blood.
  • If your blood does not clot when mixed with anti-Rh serum, then 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 then you can receive transfusions from people with types Rh-positive and Rh-negative blood.
  • If you have Rh-negative blood then you can receive transfusions from people with type Rh-negative blood only.

Note: Notify your health care provider if you have had past transfusion reactions and be sure to tell them about any recent administration of blood products.

What Abnormal Results Mean

There are no abnormal values.

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