Lymphocytes are an important part of the immune system. A count significantly higher than 3,000 lymphocytes in a microliter is generally considered to be lymphocytosis in adults. In children, the threshold for lymphocytosis varies with age, but may be as high as 7,000 to 9,000 lymphocytes per microliter. Lymphocytosis or a high lymphocyte count, is an increase in white blood cells called lymphocytes.
The two primary types of lymphocytes are B lymphocytes and T lymphocytes, or B cells and T cells. Both originate from stem cells in the bone marrow and are initially similar in appearance. Some lymphocytes migrate to the thymus, where they mature into T cells and they develop into B cells in human beings. Lymphocyte counts that are below the reference range results in lymphocytopenia (lymphopenia).
Related Journals of Blood Lymphocytes