The window period for HIV is about four weeks (2w-6w), and going for testing during this period will likely result in a negative result. However, patients who go for HIV testing will generally find that hospitals and CDCs around the world require patients to be retested within 90 days, but this does not mean that 90 days is the window period for HIV, which is mainly related to the testing equipment and methods around the world, and the most conservative time is 90 days. Generally, the antibody is tested four weeks after the high-risk behavior, and most patients are able to detect AIDS antibody at four weeks. If the result is negative at four weeks, then you can wait until eight weeks or 12 weeks to be tested again, and if no positive result occurs even at 12 weeks, then you can basically consider excluding AIDS.