Dictionary:
lym·pho·cy·to·sis (lĭm'fō-sī-tō'sĭs)  |
A condition marked by an abnormal increase in the number of lymphocytes in the bloodstream, usually resulting from infection or inflammation.
lymphocytotic lym'pho·cy·tot'ic (-tŏt'ĭk) adj.| 5min Related Video: lymphocytosis |
| Dental Dictionary: lymphocytosis |
An absolute or relative increase in the normal number of lymphocytes in the circulating blood. Various limits are given; for example, absolute lymphocytosis is said to be present if the total number of cells exceeds 4500/mm3, whereas relative lymphocytosis is said to be present if the percentage of lymphocytes is greater than 45% and the total number of cells is less than 4500/mm3. Lymphocytosis may be associated with infancy, exophthalmic goiter, mumps, rubella, infectious mononucleosis, sunburn, lymphatic leukemia, pertussis, and pyogenic infections in childhood.
| Veterinary Dictionary: lymphocytosis |
Increase in the number of normal lymphocytes in the blood or in an effusion.
| Wikipedia: Lymphocytosis |
| Lymphocytosis | |
| Classification and external resources | |
| ICD-10 | D72.8 |
|---|---|
| ICD-9 | 288.8 |
| DiseasesDB | 7678 |
| MeSH | D008218 |
Lymphocytosis is an increase in the number or proportion of lymphocytes in the blood, usually detected when a complete blood count is routinely obtained. Lymphocytes normally represent 20 to 40% of circulating white blood cells. The absolute lymphocyte count (ALC) can be directly measured by flow cytometry, or calculated by multiplying the total white blood cell (WBC) count by the percentage of lymphocytes found in the differential count[1]. In absolute lymphocytosis, the total lymphocyte count is elevated above the population reference range (normal). In adults, absolute lymphocytosis is present when the absolute lymphocyte count is greater than 4000 per microliter, in older children greater than 7000 per microliter and in infants greater than 9000 per microliter[2]. Relative lymphocytosis occurs when there is a higher proportion (greater than 40%) of lymphocytes among the white blood cells, however, absolute lymphocyte count (ALC) is normal (less than 4000 per microliter. Relative lymphocytosis is normal in children under age 2.
Contents |
Lymphocytosis is a feature of infection, particularly in children. In the elderly, lymphoproliferative disorders, including chronic lymphocytic leukaemia and lymphomas, often present with lymphadenopathy and a lymphocytosis. The symptoms of the underlying disease.........
Fever, general malaise, sore throat, lymphadenopathy, and atypical lymphocytes in the blood.
Causes of absolute lymphocytosis include:
Causes of relative lymphocytosis include: age less than 2 years; acute viral infections; connective tissue diseases, thyrotoxicosis, Addison's disease, and splenomegaly with splenic sequestration of granulocytes.
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Copyrights:
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 | Dictionary. The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2007. Published by Houghton Mifflin Company. All rights reserved. Read more |
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| Dental Dictionary. Mosby's Dental Dictionary. Copyright © 2004 by Elsevier, Inc. All rights reserved. Read more |
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| Veterinary Dictionary. Saunders Comprehensive Veterinary Dictionary 3rd Edition. Copyright © 2007 by D.C. Blood, V.P. Studdert and C.C. Gay, Elsevier. All rights reserved. Read more |
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| Wikipedia. This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Lymphocytosis". Read more |
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