Fourth-generation antigenic antibodies generally refers to HIV fourth-generation testing. HIV fourth generation test is negative after 4~6 weeks can be excluded. The exact time depends on the severity of the disease, the patient’s own situation and other factors. AIDS fourth generation test is to detect the antigen and antibody of AIDS. If you are infected with HIV and the results are negative after 4-6 weeks of HIV 4th generation testing, HIV infection can be ruled out. If HIV antigen and antibody are detected and the result is positive, HIV can be suspected and the patient can be retested. The results of the fourth generation HIV test can be available for some patients as early as 4 weeks, or even earlier. The exact time can be affected by the severity of the disease, the patient’s own situation and other factors. If a patient is diagnosed with AIDS after retesting, he or she should go to the hospital in time for treatment.