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Blood disordersDetected by blood test

Low blood lymphocytic count (lymphopenia)

A reduced number of lymphocytes, the cells central to immune defense, often caused by infection, medication, or an underlying immune disorder. Blood testing detects the deficit and prompts a search for the cause.

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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