what are lymphocyte count
Definition. Lymphocytosis (lim-foe-sie-TOE-sis), or a high lymphocyte count, is an increase in white blood cells called lymphocytes (LIM-foe-sites). Lymphocytes are an important part of the immune system.They help fight off diseases, so it's normal to see a temporary rise in the number of lymphocytes after an infection.A count significantly higher than 3,000 lymphocytes in a microliter of blood is generally considered to be lymphocytosis in adults.ymphocytes are an important part of the immune system. They help fight off diseases, so it's normal to see a temporary rise in the number of lymphocytes after an infection. A count significantly higher than 3,000 lymphocytes in a microliter of blood is generally considered to be lymphocytosis in adults.