What is the rate of lymphocytes in the blood?

The main function of lymphocytes is to recognize viruses, bacteria, fungi, tumor cells and their destruction. Approximately 70-80% of these cells are transferred from the blood to the thymus gland (thymus gland). There, they turn into T-lymphocytes, which are involved in the recognition of microbes, as well as in regulating the body's immune response. Another part of the cells is converted to B-lymphocytes. Upon contact with the causative agent of the disease, they secrete antibodies - proteins that destroy microbes. The third type is NK lymphocytes, they provide protection against viral infections and against tumor cells.
The determination of the number of lymphocytes is included in the complete blood count. The rate of their content in the blood varies with age. For children under one year, it is 4-10.5 thousand / ml (absolute amount) or 61% (relative amount). In children under 4 years old the rate of lymphocytes is 2-8 thousand / ml or 50%, in children under 6 years old - 1.5-7 thousand / ml or 42%, in children under 10 years old - 1, 5-6.5 thousand / ml or 38%.At the age of 21, they should be contained in the amount of 1–4,8 thousand / ml or 34%. The norm of lymphocytes for adults is 1-4.5 thousand / ml or 34%. In immunodeficient states, allergic, infectious, oncological autoimmune diseases, transplant conflicts, the number of these cells can change significantly.
A condition in which the level of lymphocytes rises is called lymphocytosis. A condition with a decrease in their number is called lymphopenia. Lymphocytosis is observed in viral diseases (influenza, viral hepatitis, adenovirus infection, infectious mononucleosis, chickenpox, whooping cough, measles, rubella), in blood diseases (lymphocytic leukemia, lymphosarcoma), infectious diseases of non-viral origin (malaria, tuberculosis, syphilis, malaria, syphilis, diphtheria, diphtheria) ), with an increase in the level of thyroid hormones (thyrotoxicosis), after removal of the spleen, in some allergic processes (serum sickness, bronchial asthma), in thymus hyperplasia (thymus gland), during recovery rehabilitation pro gram after infection.

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