What Level of Lymphocytes is Dangerous?

Lymphocyte Count in Adults: Normal, Elevated & Critical Levels

Lymphocytes are a type of white blood cell responsible for fighting infections and defending the body from various diseases. The lymphocyte levels in an adult usually range from 1,000 to 4,800/µL of blood. However, if the lymphocyte levels rise above 4000/µL of blood, it is dangerous.

What are Lymphocytes?

It is a white blood cell produced in the bone marrow. It contributes to about 18% to 42% of the overall white blood cells circulating in your bloodstream. They are approximately the same size as red blood cells and are in constant motion throughout the circulatory and lymphatic systems. This motion allows it to identify foreign bodies and prevent the disease from spreading.   

What Does a High Lymphocyte Level Indicate?

A high lymphocyte count might be a temporary situation. It is your body's natural response to an existing infection or inflammation. However, if such a high count persists, it can be a sign of lymphocytosis. It is a serious condition in adults.

When the T cell (responsible for killing cancerous cells and controlling the immune response against foreign substances) count is higher than the healthy range, it can indicate STIs. Whereas, when the level of B cells increases, it indicates multiple myeloma, chronic lymphocytic leukaemia, or Waldenström’s disease.  

What Conditions Cause High Lymphocyte Levels?

Multiple conditions cause persistently high levels of lymphocytes, such as:

1. Viral Infection

• Hepatitis A and C
• Epstein-Barr virus (causes mononucleosis)
• Cytomegalovirus (CMV)
• Influenza (flu)
• HIV

2. Parasitic Infections

• Toxoplasmosis

3. Bacterial Infections

• Syphilis
• Whooping cough
• Tuberculosis (TB)

4. Autoimmune Diseases

• Rheumatoid arthritis

5. Cancers

• Large granular lymphocytic leukaemia
• Chronic lymphocytic leukaemia (CLL)
• Acute lymphoblastic leukaemia
• Non-Hodgkin lymphoma

If a high lymphocyte level continues to persist, medical experts will recommend further tests to identify the underlying cause.  

What are the Symptoms of High Lymphocytes?

There are no exact symptoms of this condition, as it differs based on the underlying health issue. In certain cases, a person suffering from lymphocytosis might not even observe symptoms.

However, some common symptoms that are most prevalent in association with high lymphocytes are as follows:

• Lymphadenopathy (swelling in lymph nodes)
• Splenomegaly, which means having an enlarged spleen. It causes mild pain in the upper left part of the abdomen.

How is High Lymphocyte Treated?

Treatment for an increase in lymphocytes depends upon the underlying condition. For cancer, experts can recommend treatments like:

• Radiation Therapy
• Chemotherapy
• A stem cell transplant or bone marrow
• Immunoglobulin therapy

When to See a Medical Expert?

Having high lymphocyte levels is not dangerous if it does not persist for too long. If your body is fighting an inflammatory condition and is positively responding to antibiotics, you might not need a consultation.

But if you are observing these certain symptoms. Such as losing significant weight, extreme feeling of tiredness, notable swelling around lymph nodes or having a fever even after taking antibiotics. You must consult an expert to know the reason behind such high levels of lymphocytes.