HIV can be detected, but HIV testing should be avoided during the window period, because testing during the window period may result in false negatives, which means that the status of the infection may not be detected during the window period. Different testing technologies generally have different window periods. The most powerful testing technology at present is the detection of HIV-RNA, which makes it possible to confirm the diagnosis about 7-10 days after an infected person is infected with HIV. In the case of HIV antigen and antibody testing, the diagnosis can also be confirmed about 2-3 weeks after HIV infection. In the case of HIV antibody testing alone, the HIV antibody can be detected in the patient’s body about 3-4 weeks after HIV infection, allowing for a definitive diagnosis.