Blood typing - Results
Alternative Names
Cross matching; Rh typing; ABO blood typing
Normal Values:
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 B is added, you have type O blood.
Back typing:
- If your blood clumps together when B cells are added to your sample, you have type A blood.
- If your blood clumps together when A cells are added to your sample, you have type B blood.
- If your blood clumps together when both 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: 11/10/2008
- David C. Dugdale, III, MD, Professor of Medicine, Division of General Medicine, Department of Medicine, University of Washington School of Medicine; and James R. Mason, MD, Oncologist, Director, Blood and Marrow Transplantation Program and Stem Cell Processing Lab, Scripps Clinic, Torrey Pines, California. 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.