Define in session: in the process of meeting formally; conducting classes â in session in a sentence in the process of meeting formally; conducting classesâ¦ See the full definition
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 white blood cell count may also indicate the presence of a serious bacterial, viral, or fungal infection that attacks the immune system, such as the human immunodeficiency virus . Some congenital disorders, including lupus and myelofibrosis, cause the body to attack its own defense system, depleting bone marrow and white blood cells.