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Definition
By Mayo Clinic staffA 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. A count lower than 3,500 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.
- Laboratory reference values. Leukocytes. Rochester, Minn.: Mayo Foundation for Medical Education and Research; 2010.
- Blood studies; hematology and coagulation. In: Fischbach FT, et al. A Manual of Laboratory and Diagnostic Tests. 8th ed. Philadelphia, Pa.: Lippincott Williams & Wilkins; 2009. http://ovidsp.ovid.com/ovidweb.cgi?T=JS&NEWS=N&PAGE=booktext&D=books&AN=00140036/7th_Edition/11&XPATH=/OVIDBOOK%5B1%5D/METADATA%5B1%5D/TBY%5B1%5D/EDITORS%5B1%5D. Accessed July 12, 2010.
- Hutchison RE, et al. Leukocytic disorders. In: McPherson RA, et al. Henry's Clinical Diagnosis and Management by Laboratory Methods. 21st ed. Philadelphia, Pa.: W.B. Saunders Company; 2006. http://www.mdconsult.com/das/book/body/209419348-6/0/1393/0.html. Accessed July 12, 2010.
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