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Test to confirm HIV year after sex, P24ANTIGEN test.

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On 2 June 2015 I done unprotected vagianal sex .after 12 days HIV 1rna pcr test result target not detected. After 17 days p24 antigen combo test result index value .27 after 20 June I continue headache. I have no other symptoms or any problems.please doctor tell me how much my these test are reliable. And now which test and when do so that I know my status whether I am infected or not.

Category: Family Physician-GP

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Category: HIV- AIDS Specialist
 22 Doctors Online

Thank you for your query at
I understand your concern.
It is always advisable to wait for 6 weeks to get a conclusive result. Sometimes the test reports can be negative if tested this early.
So, you should repeat the test at the end of 6 weeks.
These tests are definitely reliable, but the time-frame is extremely important. HIV PCR test is the most sensitive test, and if it is negative at the end of 17 days, it is likely to remain negative. So, do not worry.

Patient replied :

In my case RNA pcr test done after 12days .is this reliable? And now I go for which test?

No, at 12 days it can't be as reliable.
Please repeat the RNA PCR at 6 weeks for confirmation.

Patient replied :

Now which test give me early results

I clearly mentioned in the first post, you can go ahead and get the 4th generation test done, but we won't consider it 100 % negative, if it is done before 1 month.
PCR RNA can be detected as early as 2 weeks, but in most cases, it takes 3-4 weeks to show up, and is the earliest that can be done.
So, at least wait for 4 weeks, and repeat the RNA PCR.

Dr. Jaydeep Tripathy
Category: HIV- AIDS Specialist
MBBS from Sri Ramachandra University in December 2011
M.Med (Family Medicine) - TNMGR University, Chennai
MBA-MPH in Public Health in March 2016, SRM University
Finished AFIH in March 2016, SRM University
MRCP ( UK ), Internal Medicine, Royal College of Physicians, June 2016
Fellowship in Diabetology from Martin Luther University in January 2017

Currently Resident Physician, in MD Radiodiagnosis - Kamakshi Memorial Hospital, Chennai
Dr. Jaydeep Tripathy and 4 other Medical Specialists are ready to help you

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