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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.
In HIV negative people, the normal range for the CD4:CD8 ratio is between 0.9 and 1.9. This means that there are about 1 to 2 CD4 cells for every CD8 cell. When not on HIV treatment, just like the CD4 count and CD4%, this ratio drops over time.