Answer
CD4 cells, also called helper T cells, are white blood cells that help your body fight infections. A CD4 count is a blood test that shows how many of these cells are in your blood. It helps check how healthy your immune system is if you’re living with HIV. For people without HIV, the normal range is about 500–1,500. With treatment, the goal is to keep the CD4 count as high as possible. A CD4 count below 200 means an AIDS diagnosis and a higher risk of serious infections. Learn more in our article, HIV: The Basics.
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