Lymphocytes are white blood cells that help fight infections and diseases. Learn about the different types of lymphocytes, what they do, and what high or low levels mean for your health. Lymphocytes , a type of white blood cell (WBC), are important for immune system function. They help the body defend against pathogens (foreign invaders) that can lead to diseases or infections. This article reviews elevated lymphocyte counts, exploring their potential causes, implications, and diagnostic methods. Understanding lymphocyte counts can be helpful for both healthcare practitioners and patients. Lymphocytosis is the presence of too many white blood cells. Learn about the possible causes, symptoms, and treatment options when necessary here. Lymphocytes (a type of white blood cell) form the primary immune defense and offer protection against various infections. 1,000–4,800 cells per microliter of blood (1.0–4.0 x 10⁹/L) is the normal range for lymphocytes , which account for 20-40% of total WBCs. In children, until the immune system matures (which happens at age 7 or 8), the lymphocyte range is slightly high . A lymphocyte count that is lower or higher than this range should be evaluated to find out the underlying cause and ...
