When to see a doctor

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.