The CDC states that AIDS can be ruled out when AIDS-specific antibodies, antigens, or nucleic acids have not been detected for about three months.
After high-risk sex, an HIV antibody test is usually done once at two weeks, four weeks, six weeks, and twelve weeks. Blood cards are more accurate than saliva and urine cards, so it is best to use them.
Clinically, there are three generations of cards and four generations of cards, and the four generations of cards are more accurate. If you use a four-generation card you can usually rule it out completely in about six weeks. However, in order to allay fears of HIV infection, it is best to test again at twelve weeks, regardless of whether the card is a third-generation or fourth-generation card, and if it is negative, the possibility of being infected has been completely ruled out.
Regardless of when the test result is positive, you need to go to the CDC or an authoritative hospital in time for further confirmatory tests. Aggressively block treatment to prolong the incubation period.