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T-lymphocytes-helpers (CD4) in the blood
Last reviewed: 18.10.2021
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Normally, the number of T-lymphocyte helper cells in the blood in adults is 36-55%, the absolute amount is 0.4-1.1 × 10 9 / l.
T-lymphocytes-helpers are the inducers of the immune response, regulate the strength of the immune response to a foreign antigen and control the constancy of the body's internal environment (antigenic homeostasis). An increase in the number of T-lymphocyte-helpers indicates a hyperactivity of immunity, a decrease in immunological failure.
The ratio of T-helpers and T-suppressors in the peripheral blood plays a leading role in assessing the state of the immune system, since the intensity of the immune response depends on this. In the norm of cytotoxic cells and antibodies, as much as they are necessary for the removal of one or another antigen should be produced.