You may have a lymphocyte count that is higher than would normally be expected but have few, if any, symptoms. It's usually a harmless, temporary situation, as can occur after an illness. But it may represent something more serious, such as a blood cancer or a chronic infection. Your doctor may need to perform other tests to determine if your lymphocyte count is a cause for concern.
If your doctor determines that your lymphocyte count is high, the test result may be evidence of one of the following conditions:
- Infection (bacterial, viral, other)
- Cancer of the blood or lymphatic system
- An autoimmune disorder causing ongoing (chronic) inflammation
Specific causes of lymphocytosis include:
- Acute lymphocytic leukemia
- Chronic lymphocytic leukemia
- Cytomegalovirus (CMV) infection
- Other viral infections
- Vasculitis (blood vessel inflammation)
- Whooping cough
Jan. 11, 2018
Causes shown here are commonly associated with this symptom. Work with your doctor or other health care professional for an accurate diagnosis.
- Coates TD. Approach to the adult with lymphocytosis or lymphocytopenia. http://www.uptodate.com/home. Accessed May 19, 2016.
- CBC with differential, blood. Mayo Medical Laboratories. http://www.mayomedicallaboratories.com/test-catalog/Clinical+and+Interpretive/9109. Accessed May 19, 2016.
- Kaushansky K, et al. Lymphocytosis and lymphocytopenia. In: Williams Hematology. 9th ed. New York, N.Y.: The McGraw-Hill Education; 2016. http://accessmedicine.com/book.aspx?bookID=1581. Accessed May 19, 2016.
- AskMayoExpert. Lymphocytosis? Rochester, Minn.: Mayo Foundation for Medical Education and Research; 2015.