The biomarker "% CD 3 Pos. Lymph." in a T + B-Lymphocyte Differential panel from Labcorp refers to the percentage of lymphocytes in the blood that are CD3 positive. CD3 is a protein complex and a T-cell co-receptor that defines T-lymphocytes, which are crucial components of the immune system.
This marker is used to evaluate the immune system's health, particularly in diagnosing and monitoring conditions affecting T-cell function, such as immunodeficiency disorders or certain types of leukemia. The measurement of CD3 positive lymphocytes helps in understanding the proportion of T cells in the overall lymphocyte population, providing insight into the body's adaptive immune response.
Every lab result you’ve ever had, charted and explained.
Healthmatters is a tracker for your lab results. Upload a report from any lab, any country — every marker charted and explained.
Start with my report →All our content is backed by peer-reviewed studies, academic research, and trusted medical sources. We’re committed to accuracy and transparency — see our editorial policy for details.