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how long does it takes to detect HIV after having sex?

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I had unprotected sex with prostitute, however I didn't entered my entire penis into her vagina. I want to know how long does it takes to detect HIV after having sex. I don't know whether she was infected with one or not.
Please reply urgently. I just inserted my tip of penis inside her vagina. However, I am not sure whether I am infect or not. please suggest me something.

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replied June 5th, 2011
HIV and AIDS Answer A23722
Hello and welcome to e health forum.

It is natural to be anxious when posed with the question, of possible infection with a incurable disease ‎like HIV. ‎

But, you need to understand, that a person gets infected only when the partner in question, infact is ‎infected with HIV, and has very high titres. ‎‎

Though, the risk of infection, by just genital contact, without complete intercourse is comparatively ‎very less, than that due to complete intercourse, the risk is still present.‎

The best time to do a ELISA test for HIV antibodies is after 4 weeks of exposure. 90% of normal ‎individuals who have HIV exposure, will seroconvert within 4-6 weeks. The sensitivity of the ELISA test ‎is 99.9%. ‎

If a test once done after 12 weeks of exposure - is NEGATIVE, the chances of developing antibodies to ‎HIV at a later date will be negligible. Hence there is no need to repeat the test again. ‎

I hope this helps.

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