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All the types of white blood cells are reflected 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. This can also be referred to as the leukocyte count and can be expressed in international units as 4.3 - 10.8 x 109 cells per liter. A low white blood cell count is called leukopenia. A high white blood cell count is termed leukocytosis.
When someone's white blood cell count is low, his immune system isn't as strong as usual and he's at increased risk of infection, a condition known as neutropenia. The lower his white blood cell count is -- and the longer it stays low -- the higher the risk that he'll get sick or contract some type of infection. (Normal white blood cell counts range from 4,500 to 11,000 WBCs per cubic millimeter of blood. For more information, see understanding low white blood cell counts. Fever is often the first sign of infection, so keep an eye on his temperature. Call his doctor if his temperature climbs above 100 degrees.