CD3+ T Cell Count (Peripheral Blood)

What Is CD3+ T Cell Count Used For?

Doctors may order this test to evaluate your immune system, especially if you have symptoms like frequent infections, unexplained fatigue, or immune-related conditions. It can also help monitor treatment responses in certain diseases, such as autoimmune disorders or cancers like leukemia.

How Is the Test Performed?

A small blood sample is drawn from a vein, typically in your arm. The blood is then analyzed in a lab to count the CD3+ T cells. This is usually done using a specialized blood test that separates and identifies different types of white blood cells.

Preparation for the Test

No special preparation is needed for this test. You can eat, drink, and go about your normal activities as usual. If you are on certain medications or have a condition that might affect your immune system, let your healthcare provider know before the test.

What Are the Possible Results?

Results are typically reported as a count of CD3+ T cells per microliter (µL) of blood. While specific reference ranges can vary by lab, lower than expected counts may suggest immune deficiencies or certain diseases, while higher counts might be seen in certain infections or inflammatory conditions.