Blood count
Lymphocytes
LOINC 731-0 · /uL
Ranges
Reference range: 1000–4800 /uL
What it is
Lymphocytes are white blood cells central to the immune system, including the cells that fight viruses and make antibodies.
Why it matters
Their count helps assess immune status and the body's response to infection.
What high values can mean
A higher count is common with viral infections and some chronic immune conditions.
What low values can mean
A lower count can follow stress, steroid use, some infections or treatments affecting the immune system.
How to improve it
Counts usually normalise as an infection resolves; supporting general immune health is the broader goal.
Food & lifestyle
Adequate sleep, balanced nutrition and managing stress support healthy immune function.
Preparing for the test
Part of a complete blood count (CBC) with differential; fasting is not required.
When to talk to a doctor
Discuss a persistently abnormal lymphocyte count with a doctor, interpreted with your whole CBC.
Related markers
Sources
- MedlinePlus (NIH)
- Testing.com (AACC)
Content reviewed on June 26, 2026
Medical disclaimer
This content is for educational purposes only. It is not medical advice and does not diagnose, treat, or prevent any condition. Reference ranges vary between laboratories — always use the range printed on your report and discuss your results with a healthcare professional.
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