A low white blood cell count, or leukopenia, is a decrease in disease-fighting cells (leukocytes) circulating in your blood.
The threshold for a low white blood cell count varies from one medical practice to another. Some healthy people have white cell counts that are lower than what's considered normal. A count lower than 4,000 white blood cells per microliter of blood is generally considered a low white blood cell count. The threshold for a low white blood cell count in children varies with age and sex.
Low white blood cell count
Specific causes of low white blood cell count include:
- Aplastic anemia
- Certain medications, such as antibiotics and diuretics
- Hypersplenism, a premature destruction of blood cells by the spleen
- Infectious diseases
- Kostmann's syndrome, a congenital disorder involving low neutrophil production
- Myelodysplastic syndromes
- Myelokathexis, a congenital disorder involving failure of neutrophils to enter the bloodstream
- Other autoimmune disorders
- Other congenital disorders
- Parasitic diseases
- Radiation therapy
- Vitamin deficiencies
Causes shown here are commonly associated with this symptom. Work with your doctor or other health care professional for an accurate diagnosis.