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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.
What is a low white blood cell count? A low white blood cell (WBC) count is a decreased number of white blood cells (leukocytes) in the blood. A low WBC count is referred to medically as leukopenia. WBCs, which are produced in the bone marrow, are an important part of your immune system and your bodyâs natural weapon to fight off bacteria, viruses and other germs.