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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.