The predominant leukocyte in most domestic mammals is theneutrophil, and its normal cell morphology differs between species. Manual blood smear evaluation is recommended to confirm an automated leukocytecountand differential reported by an analyzer.
When acat'sbody detects a threat, it signals the bone marrow to release moreneutrophilsinto the bloodstream, resulting inelevatedneutrophilcounts. Normalneutrophillevels vary slightly depending on the laboratory reference but generally fall within a specific range for healthycats.

Abstract Objective—To describe diseases, prognosis, and clinical outcomes associated with extreme neutrophilic leukocytosis incats. Design—Retrospective study. Animals—104catswith extreme neutrophilic leukocytosis. Procedure—Medical records from 1991 to 1999 were examined to identifycatsthat had ≥ 50,000 WBC/µl with ≥ 50%neutrophils. Signalment, absolute and differential WBC ...

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White blood cells (leukocytes) includeneutrophils, lymphocytes, monocytes, eosinophils, and basophils. Complete bloodcounts(CBCs) measure the numbers of each type and help diagnose disease. An increased totalcountis called leukocytosis. A decreasedcountis called leukopenia. Neutrophilia (a high number ofneutrophils) is often caused by inflammation, by hormones in the body that are ...

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There are two types of left shift patterns; non-regenerative left shift usually indicates overwhelming infection, and is characterized by a left shift with normal to decreased numbers of segmentedneutrophils. Presence ofneutrophiltoxic changes (Dole bodies, basophilic or vacuolated cytoplasm) usually supports bacterial infection.