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White blood cell count is the number of white blood cells in the blood. White blood cells are the infection-fighting cells in the blood and are distinct from the red (oxygen-carrying) blood cells. There are different types of white blood cells, but all types are included in the white blood cell count. The normal range for the white blood cell count varies between laboratories, but is usually between 4,300 and 10,800 cells per cubic millimeter of blood.