T (thymus derived) lymphocyte count

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Blood test

Overview Risks Results

T (thymus derived) lymphocyte count

Lymphocytes make up 16-45% of white blood cells. Of those lymphocytes, about half are T cells, a quarter are B cells, and another quarter are natural killer cells.

• Helper T-cells, also known as absolute CD4+ or T4 count: more than 400 per microliter, or 32-68% of lymphocytes
• Suppressor T-cells, also known as absolute CD8+ or T8 count: 150-1000 per microliter

There are several ways to count T cells and the normal range may vary with the method used.

Greater-than-normal T-cell levels may indicate:

• Infectious mononucleosis (sometimes)
• Multiple myeloma
• Acute lymphocytic leukemia

• Congenital T-cell deficiency (rare)
• Congenital immunodeficiency disorders
• Acquired immunodeficiency disorders
• Leukemias
• Cancer
• Hodgkin's
• Acute viral infection
• Waldenstrom's macroglobulinemia
• AIDS
• Side effect of radiation therapy
• Effect of aging

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