Lymphocyte response examples
Biomarker library
Full Blood Count
Lymphocyte count
Lymphocytes are your immune system's specialists: T cells that coordinate the response and kill infected cells, B cells that make antibodies, and natural killer cells that destroy infected and abnormal cells.
Measured in your health assessment, with a doctor to explain your result. Book yours
Why it matters
They hold your immune memory, which is why you rarely catch measles twice and why vaccines work. Most of them live in your lymph nodes, spleen and gut rather than in your blood.
What a result can mean
Lower than the range
Lymphocytes can fall after a viral illness, physical stress, heavy exercise, steroid treatment or poor nutrition, and they drift down slowly with age. Very low counts are seen with some immune conditions and treatments.
Higher than the range
Raised lymphocytes are common during and after viral infections such as glandular fever. A persistently high count in an older adult can point to chronic lymphocytic leukaemia, which is often slow-growing and found on routine tests.
What can help
A one-off change is usually rechecked after any infection has passed. Good sleep, regular activity and a varied diet support normal immune function, and persistent changes are investigated.
Read it with
NoteGeneral educational illustration. Colours, sizes and movement are simplified. This is not a scan or a simulation of your body. General information, not personal medical advice: a doctor reads your own results with your history.
Know your lymphocyte count.
Measured in your health assessment and explained by the doctor who reviews your results.