confusion about Ag P24/Ab testing

[silly979]

Hello,

I am a female and had sex with a man with unknown status.  The condom fell off and I don't know if there was any pre-ejaculation.  But he did not ejaculate inside of me.  I got tested with the HIV Ag P24/HIV ab (type 1 +2) at exactly 8 weeks after the incident.  The test came out negative thankfully.  My confusion is the gap period between p24 being non-detectable and antibodies not yet forming.  They say that the test is conclusive at 28 days...what about at 8 weeks?  Is that enough time for antibodies to form and be detectable even if the p24 disappeared?  Is there any need to go by the 3 month window?  Is the 99.8% accuracy rate for 28 days only, or also at 8 weeks? Please clear up this confusion.  Thank you

[cna341]

to your question no test will lose it's reliability over time.8 week test will have the same accuracy even more.

[Teak]

Some people may test positive but not all reason for the 3 month conclusive test.

[cna341]

p24 antigen will not disappear by itself.releasing antibodies in the body will make it disappeared by that time antibodies will be detectable in tests.this is the reason that many experts believe that ab/ag test will shorten the window period because an infected person will test positive after 28 days for antibodies or p24 antigen or both of them.
your test result will not change but to be conservative have a final test after 12 weeks for a conclusive result.

[Teak]

Yes you need to test at 3 months for a conclusive test result.