Lymphocytes (%)
Lymphocytes (%) is the proportion of your white blood cells that are lymphocytes, a family that includes the T cells, B cells, and natural killer cells. It's one component of the white blood cell differential.
Lymphocytes drive your body's targeted, longer-term immunity, including the response to viruses and the antibodies you form after infection or vaccination. Their share of white cells helps clinicians understand the character of your immune activity.
An above-range lymphocyte percentage frequently accompanies viral infections and can also appear with certain chronic infections or, less commonly, blood conditions. As a proportion, it's most useful when read together with the absolute lymphocyte count.
A below-range percentage can occur with acute infections, physical stress, steroid use, or certain immune conditions.
Lymphocytes typically make up roughly 20-40% of white cells in adults, though this shifts with the rest of the differential. Interpret alongside the absolute count and your clinician's read.
Sources
Educational context only, not medical advice or a diagnosis. Reference ranges vary by lab, age and sex; always discuss your results with a clinician.