A high lymphocyte count is usually found from tests done for other reasons or to help diagnose another condition.

Talk with a member of your health care team about what your test results mean. A high lymphocyte count and results from other tests might show the cause of your illness.

Often, follow-up testing over several weeks shows that the lymphocytosis has cleared up. Special blood tests can be helpful if the lymphocyte count stays high. If the condition stays or the cause isn't known, you might be referred to a doctor who specializes in blood diseases, called a hematologist.