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The hematocrit (Ht or HCT), also known by several other names, is the volume percentage (vol%) of red blood cells (RBCs) in blood, measured as part of a blood test. The measurement depends on the number and size of red blood cells. It is normally 40.7-50.3% for males and 36.1-44.3% for females. It is a part of a person's complete blood count

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