Lymphocytes are white blood cells that play a role in fighting disease. They are present in the lymphoid tissue and the blood. The spleen, bone marrow, and lymph nodes produce lymphocytes..

Usually, just one or a few types of lymphocytes are high or low, rather than all of them. Temporarily elevated lymphocytes can occur due to an infection or medication side effect. In general, temporary variation in lymphocytes is not usually a cause for alarm.

A to Z Guides Reference What Is a Differential Blood Count? Written by Cheryl Whitten Medically Reviewed by Poonam Sachdev on November 01, 2021 What Is a Manual Differential Blood Test? What Is a.

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Neutropenia (noo-troe-PEE-nee-uh) is an abnormally low level of neutrophils. Neutrophils are a common type of white blood cell important to fighting off infections — particularly those caused by bacteria.

Lymphopenia (also called lymphocytopenia) is a disorder in which your blood doesn’t have enough white blood cells called lymphocytes. Lymphocytes play a protective role in your immune system. There are three types of lymphocytes. All lymphocytes help protect you from infection, but they have different functions.

A lymphocyte is part of your immune system. Lymphocytes are small white blood cells that actually play an outsized role in defending your body from disease. Your body's immune system protects you from various invaders (such as bacteria and viruses) that can cause you harm. Lymphocytes' role in this is to fight infections by producing antibodies.