HIV can also be detected at 2 weeks, but it needs to be detected by the HIV-RNA test. Because 2 weeks is still too short a period of time, it takes 3-4 weeks to be detected if it is through antibodies and 2-3 weeks to be detected if it is the P24 antigen, but HIV-RNA can be detected in the body of an infected person in only about 7-10 days. If HIV-RNA is detected in an infected person’s body, the patient can be diagnosed with AIDS and treated. However, HIV-RNA testing is not done in hospitals, but only in the CDC or infectious disease hospitals, and it takes longer and is more expensive, so it is not routinely done.