We discussed your HIV risks on this forum back in 2008, when I informed you that your exposures were low risk.
Probably you misunderstood what your doctor said about p21, and my guess is you had a "duo" test (also called a combo test), which measures both HIV antibody and p24 antigen. Your negative result is 100% reliable. You don't have HIV. It's too bad you waited so long to be tested; you have been through 6 years of unnecessary anxiety about it. In any case, you can now put your HIV fears to rest.
Good luck-- HHH, MD
thanks dr, i have read that P24 antigen test usualy detected only on the early stage of infection and can not be detected lator on. is that true?
Yes, that is true. p24 goes away when antibody develops; in fact, it is the antibody that clears p24 antigen from the blood. Therefore, when p24 clears, if someone is infected with HIV, antibody has to be present. if both antibody and p24 are negative, it is 100% proof that someone didn't catch HIV.
That will be all for this thread. Move on. I won't have any further comments or advice.