Everyone’s blood falls into one of four groups, or types: A, B, AB or O. The type depends on the presence or absence of certain substances on red blood cells. Blood types are inherited.

An automated blood collection process that allows donors to give two units of red cells instead of one.

An automated blood collection process that allows donors to give two units of red cells instead of one.

A lower than normal number of red blood cells.

A protein produced by the body’s immune system that recognizes and helps fight infections and other foreign substances in the body.

A substance that is used to prevent the clotting or thickening of blood.

A substance on the surface of red blood cells that elicits an immune response when transfused into a patient who lacks that antigen.

Blood drawn from an individual prior to surgery and given back to the same individual if a transfusion is needed.

The soft tissue located in the cavities of bones which is responsible for blood cell and platelet production.

A virus that may cause flu-like symptoms in the general population, but can cause severe disease in premature babies, bone marrow transplant recipients, and AIDS patients.