Lymphocytes are a type of white blood cell. Learn more about lymphocytes and what a normal lymphocyte count is.

Lymphocyte counts that are too high or too low can be a sign of illness. Learn more: B and T cell screen » For the test, blood is drawn from your arm at your doctor’s office or a lab.

A low number of lymphocytes can happen if you take certain medications or have an infection or health condition that affects the immune system. Treatment can depend on the cause. Lymphocytopenia ...

DEAR DR. ROACH: I am a female and almost 75 years old. My vital signs are always normal, and I am active, but slightly overweight. I get quarterly blood draws, and every reading is in the normal ...

Although many who have this condition - called monoclonal B-cell lymphocytosis (MBL) - do not experience any symptoms, a new study shows they may have an elevated risk for several health ...

Thank you for your response to a previous question published on Medscape titled "Can Lymphocytosis Be Associated With Sjögren's Syndrome?" In your response you mentioned that CD8+ cell counts may ...