A high lymphocyte count is usually found when your doctor has ordered tests for other reasons or to help diagnose another condition you have.
Talk with your doctor about what your test results mean. A high lymphocyte count and results from other tests might indicate the cause of your illness.
Often, follow-up testing over several weeks shows that the lymphocytosis has resolved. Special blood tests can be helpful if lymphocytosis persists. Your doctor might refer you to a doctor who specializes in blood diseases (hematologist) if your condition persists or if the cause isn't apparent.
July 12, 2019
- Bain BJ, et al., eds. Approach to the diagnosis and classification of blood cell disorders. In: Dacie and Lewis Practical Haematology. 12th ed. London, Eng: Elsevier; 2017. https://www.clinicalkey.com. Accessed June 20, 2019.
- Davids MS. Approach to the adult with lymphocytosis or lymphocytopenia. https://www.uptodate.com/contents/search. Accessed June 20, 2019.
- AskMayoExpert. Lymphocytosis. Rochester, Minn.: Mayo Foundation for Medical Education and Research; 2019.
- Coates TD. Approach to the child with lymphocytosis or lymphocytopenia. https://www.uptodate.com/contents/search. Accessed June 20, 2019.
- Kaushansky K, et al., eds. Lymphocytosis and lymphocytopenia. In: Williams Hematology. 9th ed. New York, N.Y.: McGraw-Hill Education; 2016. https://accessmedicine.mhmedical.com. Accessed June 20, 2019.