Lymphocytes are white blood cells that fight viruses and produce antibodies. They include T cells and B cells.
- Normal range (adults)
- 20–45%
- Sample
- Blood
- Fasting
- Not usually needed
- Also called
- Lymphocyte, Lymph, Lymphs
Lymphocytes normal range
| Group | %Same unit in all countries |
|---|---|
| Adults | 20–45 |
Ranges vary slightly between laboratories. The range printed on your own report is the one to go by.
Why is the Lymphocytes test done?
They are part of the WBC differential in a Complete Blood Count.
What does a high Lymphocytes level mean?
High lymphocytes (lymphocytosis) are most often due to a viral infection.
Common causes
- Viral infections such as flu, glandular fever or hepatitis
- Whooping cough or tuberculosis
- Recovery phase of an infection
- Less often, chronic lymphocytic leukemia (mostly in older adults)
Diet and lifestyle tips
- Rest and hydrate
- Eat a balanced diet with fruit, vegetables and protein
- Repeat the test after recovery
What does a low Lymphocytes level mean?
Low lymphocytes (lymphopenia) can make it harder to fight viral infections.
Common causes
- Acute illness or stress
- Steroid medicines
- Malnutrition
- HIV and other infections
- Autoimmune disease
Diet and lifestyle tips
- Eat enough protein and calories
- Include zinc sources: meat, seeds, nuts, legumes
- Get adequate sleep
When should you see a doctor?
See a doctor if abnormal values persist for more than a few weeks or come with weight loss, night sweats or swollen glands.
Last updated
This page is for general education and is not a diagnosis. Normal ranges differ between laboratories, so always compare your result with the reference range printed on your own report, and discuss abnormal results with your doctor.