Blood typing

• A
• B
• C
• D
• E
• F
• G
• H
• I
• J
• K
• L
• M
• N
• O
• P
• Q
• R
• S
• T
• U
• V
• W
• X

Erythroblastosis fetalis, photomicrograph

Cross matching; Rh typing; ABO blood 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 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.

Review Date: 09/11/2006
Reviewed By: Corey Cutler, MD, MPH, FRCP(C), Assistant Professor of Medicine, Harvard Medical School; Department of Medical Oncology, Dana-Farber Cancer Institute, Boston, MA. Review provided by VeriMed Healthcare Network.