Lymphocytes %
The share of white blood cells that are lymphocytes, the cells of adaptive immunity.
| Typical reference range | 14–46 % |
Ranges vary by laboratory, method, age and sex: always use the range printed on your own report. Why labs differ.
What it measures
Lymphocytes include T cells, B cells and natural killer cells, responsible for antibody production, viral defense and immune memory.
Why it matters
The percentage helps describe immune balance; absolute lymphocyte count is preferred for clinical interpretation. The neutrophil-to-lymphocyte ratio is used as a general inflammation and stress index.
What a high result can mean
High percentages are seen with viral infections (e.g. mononucleosis), recovery from infection, and chronic lymphocytic leukemia, or when neutrophils are low.
What a low result can mean
Low percentages occur with acute stress, corticosteroids, bacterial infection (when neutrophils rise), HIV, and immunosuppressive treatments.
What affects the result
Interpret with the absolute lymphocyte count. Stress, poor sleep and steroids temporarily lower lymphocytes.
Unit
Usually reported in %.
Also called on lab reports
Lymphocytes, Lymphs, Lymph %, Lymphocyte %, Lymphocytes (%), Lymphocytes, Percent
Related tests: White Blood Cells & Differential
This page is educational and does not replace advice from a healthcare professional.