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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.
1 The value is given as a percentage of red blood cells in a volume of blood. 2  For example, a hematocrit of 38 means that 38% of the blood's volume is made of red blood cells. 3  Hematocrit and hemoglobin values are the two major tests that show if anemia or polycythemia is present.4  Hemoglobin (Hgb). The hemoglobin molecule fills up the red blood cells. 2  It carries oxygen and gives the blood cell its red color. 3  The hemoglobin test measures the amount of hemoglobin in blood and is a good measure of the blood's ability to carry oxygen throughout the body.