http://en.wikipedia.org/wiki/White_blood_cell
The number of leukocytes in the blood is often an indicator of disease. In the U.S. there are normally approximately 7000 white blood cells per microliter of blood.They make up approximately 1% of the total blood volume in a healthy adult.An increase in the number of leukocytes over the upper limits is called leukocytosis, and a decrease below the lower limit is called leukopenia. Physical properties of leukocytes (such as volume, conductivity, and granularity) may change. These changes can be due to activation, the presence of immature cells, or the presence of malignant leukocytes in leukemia.
The number of leukocytes in the blood is often an indicator of disease. In the U.S. there are normally approximately 7000 white blood cells per microliter of blood.They make up approximately 1% of the total blood volume in a healthy adult.An increase in the number of leukocytes over the upper limits is called leukocytosis, and a decrease below the lower limit is called leukopenia. Physical properties of leukocytes (such as volume, conductivity, and granularity) may change. These changes can be due to activation, the presence of immature cells, or the presence of malignant leukocytes in leukemia.
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