Blood Typing: Results and Values (Cross Matching, Rh Typing, ABO Blood Typing)

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Alternate Names : Cross Matching, Rh Typing, ABO Blood Typing

Forward typing means that:

Type A blood clots when mixed with anti-A serum.

Type B blood clots when mixed with anti-B serum.

Type AB blood clots when mixed with both anti-A and anti-B serums.

Type O blood does not clot when mixed with either anti-A or anti-B serum.

Rh-positive blood clots when mixed with anti-Rh serum.

Rh-negative blood does not clot when mixed with anti-Rh serum.

Reverse typing means that:

Serum from type A blood clots when mixed with type B blood.

Serum from type B cells clots when mixed with type A blood.

Serum from type O blood clots when mixed with type A and type B blood.

Serum from type AB blood does not clot when mixed with type A or type B blood.

What this means for transfusions:

Persons with type A blood can receive blood transfusions from donors with type A or type O blood.

Persons with type B blood can receive transfusions from donors with type B or type O blood.

Persons with type AB blood can receive transfusions from donors with type AB, type A, type B, or type O blood.

Persons with type O blood can receive transfusions from persons with type O blood.

Persons with Rh-positive blood can receive transfusions from donors with Rh-positive and Rh-negative blood.

Persons with Rh-negative blood can receive transfusions from donors with Rh-negative blood.

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Blood Typing: Preparation & Expectations

Author: David T. Moran, MD
Reviewer: Adam Brochert, MD
Date Reviewed: 09/20/01

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