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Wiktionary
lymphocytosis

n. (context pathology English) An increase in the number or proportion of lymphocytes in the blood

WordNet
lymphocytosis

n. an abnormal increase in the number of lymphocytes in the circulating blood

Wikipedia
Lymphocytosis

Lymphocytosis is an increase in the number of lymphocytes in the blood. In adults, lymphocytosis is present when the lymphocyte count is greater than 4000 per microliter (4.0 x 10(9)/L), in older children greater than 7000 per microliter and in infants greater than 9000 per microliter. Lymphocytes normally represent 20 to 40% of circulating white blood cells.

Lymphocytosis is usually detected when a complete blood count is obtained. If not provided the lymphocyte count can be calculated by multiplying the total white blood cell (WBC) count by the percentage of lymphocytes found in the differential count. The lymphocyte count can also be directly measured by flow cytometry.

Usage examples of "lymphocytosis".

It wasn't until I was twelve and he deteriorated from stage-zero lymphocytosis to stage-three anemia that I was told he was dying.