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==Introduction==
==Description==
Lymphocytosis refers to an increase in the number of circulating lymphocytes in the blood. The major causes of lymphocytosis are:
Lymphocytosis refers to an increase in the number of circulating lymphocytes in the blood. The major causes of lymphocytosis are:
*Several types of '''neoplasia''' may result in increases in the number of blood lymphocytes, including:
*Several types of '''neoplasia''' may result in increases in the number of blood lymphocytes, including:
**Stage V (leukaemic) [[Lymphoma|lymphoma]]
**Stage V (leukaemic) [[Lymphoma|lymphoma]]
**Acute lymphoblastic and chronic lymphocytic leukaemia
**Acute lymphoblastic and chronic lymphocytic leukaemia
**Bovine Leukosis caused by bovine leukaemia virus (BoLV)
**Bovine Leukosis caused by [[Bovine Leukaemia Virus|bovine leukaemia virus (BoLV)]]
*'''Stress''' may result in the release of lymphocytes into the circulation, especially in young horses and cats. This response is mediated by the release of adrenaline from the adrenal medulla and it should not be confused with the [[Stress Leucogram|stress leucogram]] produced by the release of the glucocorticoid hormones cortisol from the adrenal cortex.
*'''Stress''' may result in the release of lymphocytes into the circulation, especially in young horses and cats. This response is mediated by the release of adrenaline from the adrenal medulla and it should not be confused with the [[Stress Leucogram|stress leucogram]] produced by the release of the glucocorticoid hormones cortisol from the adrenal cortex.
*Some cases of '''chronic infection''' may be associated with lymphocytosis but reactive hyperplasia in associated lymph nodes may not correlate with the numbers of circulating lymphocytes.
*Some cases of '''chronic infection''' may be associated with lymphocytosis but reactive hyperplasia in associated lymph nodes may not correlate with the numbers of circulating lymphocytes.
*'''Hypoadrenocorticism''' may result in lymphocytosis and/or [[Eosinophilia|eosinophilia]].
*'''Hypoadrenocorticism''' may result in lymphocytosis and/or [[Eosinophilia|eosinophilia]].
{{Learning
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[http://www.cabdirect.org/search.html?it=any&q1=lymphocytosis&calendarInput=yyyy-mm-dd&occuring1=title&rowId=1&rowId=2&rowId=3&show=all&options1=AND&options2=AND&options3=AND&occuring3=freetext&occuring2=freetext&publishedend=yyyy&la=any&publishedstart=yyyy&fq=sc%3A%22ve%22&y=14&x=37 Lymphocytosis publications]
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[[Category:Haematology Changes]][[Category:Expert Review]]