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Pleocytosis is an increased cell count {Gk. pleion more}, particularly an increase in white blood cell (WBC) count, in a bodily fluid, such as cerebrospinal fluid (CSF).[1] It is often defined specifically as an increased WBC count in CSF.[2]

Increased white blood cell count in the blood is called leukocytosis.[3]


  1. ^ TheFreeDictionary > pleocytosis Citing: The American Heritage Medical Dictionary, 2007 and Saunders Comprehensive Veterinary Dictionary, 2007
  2. ^ TheFreeDictionary > pleocytosis Citing: Dorland's Medical Dictionary for Health Consumers, 2007 and Mosby's Medical Dictionary, 8th edition, 2009
  3. ^ TheFreeDictionary > Leukocytosis Citing: Gale Encyclopedia of Medicine, 2008 and The American Heritage Medical Dictionary, 2007