Leukopenia
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Leukopenia is a laboratory-diagnosed state in which the leukocytes (i.e., white blood cells) circulating in the blood drop below the minimum normal value. A typical adult lower bound is 4,500 cells per microliter, subject to laboratory variations. [1].
It may be due to a decrease in all subtypes of cell, or a decrease in one of the more prevalent types without compensating increases in the others.
The more severe the leukopenia, the less defense the body has against infection.