Lymphocyte percentage of 62.7 is generally higher than 40%, which is considered as elevated lymphocyte ratio. There are many causes of elevated lymphocyte ratio, such as viral infections, lymphoma and lymphoblastic leukemia. 1. Viral infection: As viruses invade the organism through various ways and proliferate in the cells of susceptible hosts, leading to lowered immunity and active immune response of the organism, which in turn leads to high lymphocytes and elevated lymphocyte ratio; therefore, a lymphocyte percentage of 62.7 may occur. 2. Lymphoma: caused by viral infection, defective or suppressed immune function, etc., a large number of immature lymphocytes are produced in the blood, which may be manifested as elevated lymphocytes; therefore, a lymphocyte percentage of 62.7 may occur. 3. Lymphoblastic leukemia: malignant neoplastic disease originating in hematopoietic tissues due to environmental, genetic and other factors, resulting in inhibition of apoptosis of mature B lymphocytes, which is commonly seen as elevated absolute lymphocyte values; therefore, a lymphocyte percentage of 62.7 may occur. If the lymphocyte percentage of 62.7 is found in routine blood test, one should consult a doctor in time to make a clear diagnosis and give targeted treatment under the doctor’s guidance, so as to avoid delaying the condition.