Description
Why It’s Done:
The CD3 (Pan-T Cell) test is performed for several key reasons:
• Monitor immune system function, particularly in individuals with autoimmune diseases, immunodeficiencies, or HIV/AIDS, where T-cell counts are a key indicator of immune health.
• Assess T-cell population in patients undergoing organ or stem cell transplantation to evaluate the immune system’s recovery or to monitor for graft-versus-host disease (GVHD).
• Diagnose T-cell related malignancies, such as T-cell leukemia or T-cell lymphoma, where abnormalities in the T-cell population may be detected.
• Evaluate immune responses in conditions that affect T-cell activity, such as chronic infections, autoimmune diseases, or transplant rejection.
• Monitor treatment effectiveness in patients receiving immunotherapy, chemotherapy, or immunosuppressive drugs, as these can impact T-cell counts and function.
Preparation:
• No fasting or special preparation is typically required for the CD3 test.
• Inform your healthcare provider about any medications, particularly immunosuppressive drugs or chemotherapy, as they may affect T-cell levels.
• A blood sample is collected from a vein in your arm, and it is then processed using flow cytometry to analyze the CD3+ T-cell population.
