Low white blood cell count (leukopenia)
Low white blood cell count (leukopenia)QuestionWhat causes a low white blood cell count? AnswerSometimes the cause of a low white blood cell count can't be determined (idiopathic). Known causes of a low white blood cell count (leukopenia) include:
White blood cells help fight infection in your body. A normal white blood cell count ranges from 4,500 to 10,000 cells per microliter of blood. A mild decrease in white blood cells below 4,500 cells per microliter doesn't necessarily indicate a serious illness. However, a dangerously low white blood cell count — below 2,500 cells per microliter — increases the risk of serious infection. Last Updated: 10/09/2006 © 1998-2013 Mayo Foundation for Medical Education and Research (MFMER). All rights reserved. A single copy of these materials may be reprinted for noncommercial personal use only. "Mayo," "Mayo Clinic," "MayoClinic.com," "Mayo Clinic Health Information," "Reliable information for a healthier life" and the triple-shield Mayo logo are trademarks of Mayo Foundation for Medical Education and Research.
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