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The Red Cross is also a leader in research and testing to protect the safety of the blood supply. We were among the first to develop and implement testing for many infectious diseases including, HIV, hepatitis B and C viruses, West Nile virus, and more recently the agent of Chagas disease.
A complete blood count (CBC) gives important information about the kinds and numbers of cells in the blood, especially red blood cells, white blood cells, and platelets. A CBC helps your doctor check any symptoms, such as weakness, fatigue, or bruising, you may have. This test measures the amount of space (volume) red blood cells take up in the blood. 2  The value is given as a percentage of red blood cells in a volume of blood. 3  For example, a hematocrit of 38 means that 38% of the blood's volume is made of red blood cells.