Name = Lymphocytosis
ICD10 = ICD10|D|72|8|d|70
ICD9 = ICD9|288.8
DiseasesDB = 7678
MeshID = D008218
Lymphocytosis is an increase in the number or proportion of
lymphocytes in the blood, usually detected when a complete blood countis 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 [ For example, if the total WBC count is 30,000, and the %lymphocytes is 30, the absolute lymphocyte count is 9,000 per microliter.] . 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 microliterand in infants greater than 9000 per microliter[ Miale, John B. Laboratory Medicine: hematology. 5th. St. Louis: C.V. Mosby, 1977.] . 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.
Lymphocytosis ia 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 lymphocytesin the blood.
Causes of absolute lymphocytosis include:
* acute viral infections, such as
infectious mononucleosis( glandular fever), Epstein-Barr virusinfection, and hepatitis
* other acute infections such as
protozoalinfections, such as toxoplasmosisand American trypanosomiasis ( Chagas disease)
* chronic intracellular bacterial infections such as
Acute Lymphoblastic Leukemia
Causes of relative lymphocytosis include: age less than 2 years; acute viral infections;
connective tissue diseases, thyrotoxicosis, Addison's disease, and splenomegalywith splenic sequestration of granulocytes.
* [http://pathmicro.med.sc.edu/ghaffar/bord-hemo.htm Illustration]
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Look at other dictionaries:
Lymphocytosis — vgl. Lymphozytose … Das Wörterbuch medizinischer Fachausdrücke
lymphocytosis — [lim΄fō sī tō′sis] n. [ModL: see LYMPHOCYTE + OSIS] a condition characterized by an increase in the number of lymphocytes in the blood, as in acute or chronic infection lymphocytotic [lim΄fō sītät′ik] adj … English World dictionary
Lymphocytosis — Too many lymphocytes, a finding that may be a marker for infection or disease. * * * A form of actual or relative leukocytosis in which there is an increase in the number of lymphocytes. SYN: lymphocythemia, lymphocytic leukocytosis. * * *… … Medical dictionary
lymphocytosis — n. an increase in the number of lymphocytes in the blood. Lymphocytosis may occur in a wide variety of diseases, including chronic lymphocytic leukaemia and infections due to viruses … The new mediacal dictionary
lymphocytosis — noun Etymology: New Latin, from International Scientific Vocabulary lymphocyte Date: 1896 an increase in the number of lymphocytes in the blood usually associated with chronic infections or inflammations … New Collegiate Dictionary
lymphocytosis — lymphocytotic /lim foh suy tot ik/, adj. /lim feuh suy toh sis/, n. Pathol. an abnormal increase in the number of lymphocytes in the blood. [1895 1900; LYMPHOCYTE + OSIS] * * * … Universalium
lymphocytosis — noun An increase in the number or proportion of lymphocytes in the blood … Wiktionary
lymphocytosis — n. abnormally large number of lymphocytes in the blood (Medicine) … English contemporary dictionary
lymphocytosis — lym·pho·cy·to·sis … English syllables
lymphocytosis — lym•pho•cy•to•sis [[t]ˌlɪm fə saɪˈtoʊ sɪs[/t]] n. pat an abnormal increase in the number of lymphocytes in the blood • Etymology: 1895–1900 lym pho•cy•tot′ic ˈtɒt ɪk adj … From formal English to slang