A low white blood cell count (leukopenia) is a decrease in disease-fighting cells (leukocytes) in your blood. Leukopenia is almost always related to a decrease in a certain type of white blood cell (neutrophil).
The definition of low white blood cell count varies from one medical practice to another. In general, for adults a count lower than 4,000 white blood cells per microliter of blood is considered a low white blood cell count. For children, that threshold varies with age.
Some people who are otherwise healthy have white cell counts that are lower than what’s usually considered normal, but which are normal for them.
Nov. 24, 2020
Kumar V, et al. Diseases of white blood cells, lymph nodes, spleen, and thymus. In: Robbins and Cotran Pathologic Basis of Disease. 9th ed. Philadelphia, Pa.: Saunders Elsevier; 2015. http://www.clinicalkey.com. Accessed Nov. 18, 2015.
Marx JA, et al., eds. Anemia, polycythemia, and white blood cells disorders. In: Rosen’s Emergency Medicine. 8th ed. Philadelphia, Pa.: Saunders Elsevier; 2014. http://www.clinicalkey.com. Accessed Nov. 18, 2015.
AskMayoExpert. Leuokepenia (adults). Rochester, Minn.: Mayo Foundation for Medical Education and Research; 2015.
Kliegman RM, et al., eds. Leukopenia. In: Nelson Textbook of Pediatrics. 20th ed. Philadelphia, Pa.: Elsevier; 2016. http://www.clinicalkey.com. Accessed Nov. 18, 2015.
Berliner N. Approach to the adult with unexplained neutropenia. http://www.uptodate.com/home. Accessed Nov. 18, 2015.