Normal value (total lymphocytes): 1,500 - 4,000/µl (15 and 50 %).
Absolute lymphocytosis: >4,000/µl.
a) reactive:
- Viral infections (EBV, CMV infections, rubella)
- tuberculosis, syphilis, whooping cough, M.Bang
- hypersensitivity reactions due to drugs
b)neoplastic
Monoclonal B-cell lymphocytosis
- Chronic lymphocytic leukemia