Also found in: Dictionary, Thesaurus, Medical, Wikipedia.
Related to Leukocytosis: digestive leukocytosis


Elevation of the leukocyte count to values above the normal limit.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



an increase in the absolute number of leukocytes in the peripheral blood.

Physiological leukocytosis occurs after eating and physical exertion. Symptomatic pathological leukocytosis develops with suppurative and inflammatory processes and with a number of infectious diseases, whether produced by specific causative agents of infection or as a result of the bone-marrow reaction to the breakdown of tissues caused by toxic agents or circulatory disorders (for example, myocardial infarction). Transient leukocytosis may result from the release of leukocytes into the blood from bone marrow or other tissues (for example, in stress). In all cases, the leukocytosis is reactive and disappears when its cause disappears. Leukocytosis may be produced by a malignant proliferation of hematopoietic tissue, as in leukemia.


Kassirskii, I. A., and G. A. Alekseev. Klinicheskaia gematologiia, 4th ed. Moscow, 1970.
The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
A repeat CBC showed improvement, with a moderate leukocytosis (42 600 cells/ [micro]L) and mild, toxic heterophilic changes.
Laboratory findings showed leukocytosis during the first postoperative day (WBCs 14,180/[micro]L) with WBCs up to 18,000/[micro]L during the second postoperative day; furthermore, there was an increase in CRP values.
As Matsumoto et al .[sup][3] reported a return to normal hematologic status with chemotherapy and Pandit et al .[sup][4] demonstrated that resolution of leukocytosis and eosinophilia following tumor removal.
Hypocalcaemia, leukocytosis and thrombocytosis have been reported to be a part of the paraneoplastic syndromes in renal squamous cell carcinoma.
Complete blood count showed more severe leukocytosis and a higher level of C-reactive protein than during the previous admission, and a positive stool occult blood test was also noted.
Leukocytosis (16,000/m[m.sup.3]), lymphocytosis (72%) and monocytosis (30%) were found in the blood.
histolytica cases with clinical (high fever and toxic state) and/or laboratory (leukocytosis and positive CRP) evidence of invasive amebiasis or possible unrevealed coinciding bacterial infections that are associated with E.
(5-7) The clinical symptoms of stump appendicitis resemble that of acute appendicitis: nausea, vomiting, abdominal pain, anorexia and leukocytosis. Patients relate a history of appendectomy which may bias physicians against the diagnosis of appendicitis.
Upon investigation patient had anaemia (Hb-5.8), leukocytosis (TLC 26,500), differential leukocyte count showed Eosinophilia (DLC--60% Eosinophils) (Absolute eosiniphilic count--14,100).
Another possible cause of CK elevation, which is neuroleptic malignant syndrome (NMS), was eliminated since the patient had no other symptoms such as fever or leukocytosis. Besides, he was well oriented and his mental status was normal.
A 61-year old male presented with a 12 hours of right testicular pain, scrotal erythema and raised inflammatory markers (C-Reactive Protein 324 mg/L & leukocytosis 19.9 X 109/L) on background of right inguinal hernia repair 5 years ago and more recent recurring left epididymo-orchitis.