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Finally, with further decreases in the levels of CD4 cells, the person develops AIDS. According to the CDC, for an HIV-infected person, some signs that AIDS has developed (known as AIDS-defining conditions) are: The CD4 cell count has decreased to fewer than 200 cells per cubic milliliter of blood.
Tests to tailor treatment. If you receive a diagnosis of HIV/AIDS, several types of tests can help your doctor determine what stage of the disease you have. These tests include: 1  CD4 count. 2  CD4 cells are a type of white blood cell that's specifically targeted and destroyed by HIV. 3  Even if you have no symptoms, HIV infection progresses to AIDS when your CD4 count dips below 200. 4  Viral load.