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Blood disordersDetected by blood test

Elevated lymphocyte count (lymphocytosis)

An elevated lymphocyte count, often from viral infection but sometimes from a lymphoproliferative disorder such as chronic lymphocytic leukemia. Blood testing detects the rise and guides whether further investigation is needed.

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Related biomarkers we test

Lymphocytes (abs.)

The absolute count of lymphocytes per liter of blood. Lymphocytes include T cells and B cells — the cornerstone of adaptive immunity — as well as natural killer (NK) cells, which provide innate immune defense. The absolute count is critical for assessing immune competence, as a normal percentage can hide true lymphopenia when total white blood cells are low.

Lymphocytes

Lymphocytes (including T cells and B cells) provide targeted immune responses and immunological memory.

Related conditions in Blood disorders