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Dear, fist of all thanks a lot for all the good job you are doing. I took and erotic massage, both were naked (girl and me), we have done a mutual masturbation and fingering, I am really worried about, so I have done a 4th generation test antibody and antigen p24 three times: the fist one after 10 days, the second one after 30 days and the last one after 45 days, all of them negative. So I will ask you if this type of test is definitive after 6 weeks or if I should test again at 90 days? Have you ever seen that a 4th generation test antibody and antigen p24 change the result after 45 days to 90 days? Thanks so much for you answer.


We don’t see HIV passing with the type of sex you have described. The main risk to HIV is when people have unprotected vaginal and anal sex.

Have a look at our “Know your chances” web page, it provides information on your chances of getting or passing an STI depending on how you are having sex.

The 4th generation HIV test is a good test and our lab has told us that it will pick up most cases of HIV by 6 weeks.

Given that you had a negative test at 45 days and the type of risk you had I would say there is no need to do a follow up HIV test.

Sometimes people feel that they need to do a HIV test after the window period is finished just so they can bring closure to what happened. If you feel this could be the case for you it may be worthwhile doing a final HIV test after 3 months.

Please leave a comment to let us know if this answers your question or if you need more information.

Health Nurse

For other readers, please feel free to leave a comment, or let us know if this was helpful.

This answer was posted on December 2, 2015
This answer was updated on December 28, 2018
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Categories: STI Testing
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