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Hemoglobin Hemoglobin is the most important component of red blood cells. It is composed of a protein called heme, which binds oxygen. In the lungs, oxygen is exchanged for carbon dioxide.� Abnormalities of an individual's hemoglobin value can indicate defects in red blood cell balance. Both low and high values can indicate disease states.

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| Review Date: 11/9/2004 12:00:00 AM Reviewed By: Marcia S. Brose, M.D., Ph.D., Assistant Professor, Hematology/Oncology, The University of Pennsylvania Cancer Center, Philadelphia, PA. Review provided by VeriMed Healthcare Network.
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