What does it mean if the lymphocyte percentage is elevated?

Elevated lymphocyte percentage can be caused by various factors: 1. Infectious factors: Viral infections such as Epstein-Barr virus, rubella virus, and bacterial infections like Mycobacterium tuberculosis and Staphylococcus aureus can all lead to an increased lymphocyte percentage. 2. Immune system disorders: Conditions such as multiple sclerosis, rheumatoid arthritis, and systemic lupus erythematosus may cause lymphocytosis due to abnormal immune responses attacking the body's own tissues. 3. Hematologic diseases: Blood cancers such as lymphoma and leukemia, as well as other blood disorders like aplastic anemia, may also result in elevated lymphocyte percentage. 4. Medication factors: Long-term use of certain medications, such as antibiotics or antiepileptic drugs, may affect the normal apoptosis or proliferation of lymphocytes.