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The Absolute Count for CD3 and CD4 test measures the absolute number of CD3-positive T lymphocytes and CD4-positive helper T cells in a blood sample. These immune cells play a vital role in coordinating the body’s defense against infections and maintaining immune balance. Performed using flow cytometry, the test helps assess immune system function and is commonly used in the evaluation and monitoring of immunodeficiency disorders, HIV infection, autoimmune diseases, and individuals receiving immunosuppressive therapy or organ transplantation.

Who should get this test done?

This test may be recommended for individuals who:

●     Have recurrent or persistent infections that may indicate an impaired immune system.

●     Are living with or being evaluated for HIV infection and require immune status monitoring.

●     Are suspected of having an immunodeficiency disorder.

●     Are receiving immunosuppressive therapy or have undergone organ or stem cell transplantation.

●     Need assessment of T-cell populations as part of a comprehensive immunological evaluation.

Why consider this test?

A healthy immune system depends on an adequate number of functioning T-cells, especially CD4 helper cells, which coordinate the body’s immune response. Measuring the absolute counts of both CD3 and CD4 cells provides valuable insights into immune health and helps healthcare providers detect immune deficiencies, monitor disease progression, and assess the effectiveness of treatment. The test is an important tool for guiding clinical decisions and planning appropriate patient care.

More information

This test is performed using flow cytometry, which accurately identifies and counts immune cells based on specific surface markers. CD3 represents the total T-lymphocyte population, while CD4 identifies helper T cells that regulate immune responses. Measuring their absolute counts provides a reliable assessment of immune function and is often included as part of a broader lymphocyte subset analysis. The results are interpreted in conjunction with the individual’s clinical history, symptoms, and other laboratory investigations.

Other names

●     CD3 and CD4 Absolute Count

●     Absolute T-Cell and Helper T-Cell Count

●     CD3/CD4 T-Lymphocyte Enumeration

●     CD3/CD4 Flow Cytometry Test

●     T-Cell Absolute Count Panel (CD3 & CD4)