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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.
White Blood Cell Count (WBC) This test measures the number of white blood cells in a drop (microliter) of blood. A low WBC count may be due to chemotherapy, a viral infection, a toxic reaction, or a process in the bone marrow that limits the bodyâs ability to make normal WBCs. A high WBC count may result from an infection or leukemia. A person is at an increased risk of infection if his/her WBC count drops below 1,000 cells per microliter. Normal values: Range from 3,700 to 10,500 (can be altered by exercise, stress, and disease) WBC Differential. This test tells the percentage of each type of white blood cell in the sample. Normal values are: