T-cell count

Thymus derived lymphocyte count; T-lymphocyte count; T cell count

A T-cell count measures the number of T cells in the blood. Your doctor may order this test if you have signs of a weak immune system, such as due to having HIV/AIDS.

Blood test

Blood is drawn from a vein (venipuncture), usually from the inside of the elbow or the back of the hand. A needle is inserted into the vein, and the blood is collected in an air-tight vial or a syringe. Preparation may vary depending on the specific test.

How the Test is Performed

How to Prepare for the Test

How the Test will Feel

Why the Test is Performed

Normal Results

What Abnormal Results Mean