Dr. Kakkar S
Dermatology, HIV/AIDS Specialist, Venereology
Welcome back to icliniq.com.
This recommendation of retesting at three months for a conclusive result that you read on the internet is for an HIV (human immunodeficiency virus) antibody-based test which has a window period ranging between four weeks to three months.
The HIV Duo test is conclusive at four weeks although CDC (Centers for Disease Control) considers six weeks result as conclusive.
HIV Duo is a combo test, tests for p24 antigen as well as anti-HIV antibody since more than 95% of those who are HIV infected will have circulating anti-HIV antibodies by four weeks and those who do not will certainly have P24 antigen.
Therefore the combo test reduces this window period from three months for an antibody-based HIV screening test to just two to three weeks.
This is because testing for both these markers simultaneously is more sensitive than testing only for anti-HIV antibodies (i.e detects almost all cases) which implies that a negative result is certainly true. In other words, it has negligible chances of being a false negative result.
However, if you still want to retest you may go for it. Either of the two i.e HIV antibody-based test (third generation) or an HIV combo/Duo test (fourth generation) would be equally fine and equally reliable in the fourth month.
You may also screen with a VDRL (Venereal Disease Research Laboratory) test as part of complete STD (sexually transmitted disease) screening at three months.
For more information consult an HIV AIDS specialist online --> https://www.icliniq.com/ask-a-doctor-online/HIV-AIDS-specialist