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Blood typing - Results

Alternative Names

Cross matching; Rh typing; ABO blood typing

Normal Values:

ABO typing:

If your blood cells stick together when mixed with:

  • Anti-A serum, you have type A blood
  • Anti-B serum, you have type B blood
  • Both anti-A and anti-B serums, you have type AB blood

If your blood cells do not stick together when anti-A and anti-B are added, you have type O blood.

Back typing:

  • If the blood clumps together only when B cells are added to your sample, you have type A blood.
  • If the blood clumps together only when A cells are added to your sample, you have type B blood.
  • If the blood clumps together when either types of cells are added to your sample, you have type O blood.

Lack of blood cells sticking together when your sample is mixed with both types of blood indicates you have type AB blood.

RH typing:

  • 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.
  • Reviewed last on: 2/5/2010
  • David C. Dugdale, III, MD, Professor of Medicine, Division of General Medicine, Department of Medicine, University of Washington School of Medicine; Yi-Bin Chen, MD, Leukemia/Bone Marrow Transplant Program, Massachusetts General Hospital. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.

References

Goodnough LT. Transfusion medicine. In: Goldman L, Ausiello D, eds. Cecil Medicine. 23rd ed. Philadelphia, Pa: Saunders Elsevier; 2007:chap 183.

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