Disease or Syndrome
leukopenia Audio
leu·ko·pe·ni·a [ loo-kuh-pee-nee-uh ]
Subclass of:
Leukocyte Disorders
Definitions related to leukopenia:
  • A decrease in the number of LEUKOCYTES in a blood sample below the normal range (LEUKOCYTE COUNT less than 4000).
    NLM Medical Subject Headings
    U.S. National Library of Medicine, 2025
  • An abnormal decreased number of leukocytes in the blood.
    Human Phenotype Ontology (HPO)
    The Human Phenotype Ontology Project, 2025
  • Reduction in the number of leukocytes in the blood, the count being 5000 per cubic millimeter or less.
    CRISP Thesaurus
    National Institutes of Health, 2006
  • Leukopenia is a reduction in the circulating white blood cell (WBC) count to < 4000/mcL (< 4 � 10^9/L). It is usually characterized by a reduced number of circulating neutrophils, although a reduced number of lymphocytes, monocytes, eosinophils, or basophils may also contribute. Thus, immune function can be generally decreased.
    Merck Manuals
    Merck & Co., Inc., 2025
  • Leukopenia, abnormally low number of white blood cells (leukocytes) in the blood circulation, defined as less than 5,000 leukocytes per cubic millimetre of blood. Leukopenia often accompanies certain infections, especially those caused by viruses or protozoans. Other causes of the condition include...
    Encyclopedia Britannica
    Encyclopedia Britannica, Inc., 2025
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