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This condition can be caused by certain medications and by infections. In some cases, it is caused by a cancer or precancerous condition. Myelofibrosis, bone marrow scarring that can result from various hematologic cancers, typically leads to low blood counts. Pancytopenia can also be caused by aplastic anemia, a bone marrow failure disorder that affects blood cell production.
A low number of WBCs is called leukopenia. One type of white blood cell is the neutrophil. This type of white blood cell is important for fighting infections. An adult with fewer than 1700 neutrophils in a microliter of blood has a low white blood cell count.