I had unprotected vaginal sex with a female friend who resulted to be hiv negative on a 4th generation test 21 days after we had sex, here are my questions :
1. initially I had two tests at 28 and 30 days after risk exposure, the lab told that me that they were 4th generation tests, the brand was Roche and they used reactives with cobas 600 by chemilumiscence. Can this tests considered conclusive ?
2. At 63 days after risk I had the same 4th generation test with negative result. By this time the antigen p24 can be reached ? If not can I be 100% sure that the antibody part of the test is 100% conclusive ?
I just want to put this episode behind me and start a family.
The standard tests, including the 4th gen ("duo", "combi") HIV tests, are extremely accurate, so you can be sure your partner wasn't infected. Once you knew of her result, there really was no reason for you to be tested -- although this might have made sense based on other risks in the past.
In any case, your test results at 28 and 30 days were 100% reliable, even if your partner had had HIV, and there certainly was no need for the third test at 63 days. If the test is negative, it is 100% certain that neither HIV antibody nor p24 antigen is present. Your negative results are definitive.
For more detailed information about HIV test reliability at various times after exposure, see these discussions:
You misunderstand that test; your question is nonsense. A negative result means that it is negative for both antibody and antigen, which proves you do not have HIV.
Disregard everything you think you know about the time to reliable antibody testing. The combination of negative antibody AND antigen is 100% reliable any time 4 or more weeks after exposure. That's because the two results are not independent of one another. It is the antibody that clears p24 antigen from the blood. At 4+ weeks after exposure, everyone with HIV always has antibody, antigen, or both in the blood. There are no exceptions.
Perhaps you didn't read or did not understand the discussion in the other threads linked above (maybe English isn't your primary language?).
Have you STILL not read the threads linked above? Read the first one (1704700). If you continue to ask me to repeat answers that have already been given, the entire thread will be deleted without further comment.
The Content on this Site is presented in a summary fashion, and is intended to be used for educational and entertainment purposes only. It is not intended to be and should not be interpreted as medical advice or a diagnosis of any health or fitness problem, condition or disease; or a recommendation for a specific test, doctor, care provider, procedure, treatment plan, product, or course of action. Med Help International, Inc. is not a medical or healthcare provider and your use of this Site does not create a doctor / patient relationship. We disclaim all responsibility for the professional qualifications and licensing of, and services provided by, any physician or other health providers posting on or otherwise referred to on this Site and/or any Third Party Site. Never disregard the medical advice of your physician or health professional, or delay in seeking such advice, because of something you read on this Site. We offer this Site AS IS and without any warranties. By using this Site you agree to the following Terms and Conditions. If you think you may have a medical emergency, call your physician or 911 immediately.