Lymphocyte percentage 69 is 69%, and elevated percentages are common in viral infections, infectious mononucleosis, acute infectious lymphocytosis, lymphocytic leukemia, autoimmune diseases, and the early stages of rejection after organ transplantation. The percentage of normal lymphocytes in the blood is (20%~40%), higher than 40% is called high percentage of lymphocytes. 1. Viral infections: such as cytomegalovirus infection, EBV infection, mumps, etc., which are common in clinic, often show elevated lymphocyte percentage. 2. Lymphocytic leukemia: when the white blood cell count is elevated and the proportion of lymphocytes is also elevated, the possibility of chronic lymphocytic leukemia is not excluded. If necessary, cytological examination of peripheral blood and bone marrow should be performed to clarify the diagnosis. 3. Autoimmune diseases, such as rheumatoid arthritis, connective tissue disease, etc., may show relatively high lymphocyte ratio. 4. After organ transplantation, in the early stage of rejection, there is often an increase in the percentage of lymphocytes. 5. Aplastic anemia: due to a significant decrease in neutrophils, resulting in a relative increase in the percentage of lymphocytes. Elevated lymphocyte percentage is also seen in normal children under 6 years of age. It is recommended to seek prompt medical attention and standardize treatment after a thorough examination by a physician who can make a definitive diagnosis based on the combination of symptoms, signs, and laboratory tests.