Matching Blood Types

January 25th, 2011

The red blood cells have up to two distinct chemical molecules: Molecule “A” and Molecule “B.” If a person’s red blood cell has only the “A” molecules, then the blood is classified as Type A. Conversely if only “B” molecules are found in the blood cell, then that blood is Type B. If there is a mixture of both blood cells then it is classified as Type AB. A person with blood type O means neither molecule is present.

Two different blood types cannot be mixed together because they will clump together and may result to death. So a person with Type A blood can only donate to a person with Type A or Type AB and Type B blood can only be matched with the same or Type AB. Type AB can only be mixed with Type AB. Type O blood is considered the “universal” blood type since it can be mixed with the others.