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A 27-year-old female asked:

Hi. i had unprotected sex with a guy. i went 30 days after exposure and got a blood test for hiv and syphilis they came back - should i trust this ?

4 doctor answers4 doctors weighed in
Dr. Ed Friedlander
Pathology 45 years experience
Yes: I'm going to assume that the HIV test was a nucleic acid test. I trust that you'll have good memories of this experience, however imperfect it may have been, and that you'll play safe if something like this happens again. It's good for a young adult who's not in a monogamous relationship to be checked for both of these yearly. Best wishes.
Dr. Ed Friedlander
Pathology 45 years experience
Provided original answer
I think that today's HIV tests with nucleic acid are reliable at 30 days. The syphilis tests are almost-certain to have turned by this time; you're in no danger if you repeat in a year.
Aug 2, 2015
Dr. Jalal Zuberi
Pediatrics 46 years experience
Yes, repeat in 4 wks: Due to the 4-6 wks window or incubation period of HIV, a repeat test at 6-8 wks is generally recommended for confirmation. For your safety, please avoid sex without condom, outside of a strictly monogamous relationship! Stay healthty
Dr. J. Lawrence Dohan
Dermatology 58 years experience
High risk???: Syphilis test needs no repeat. Hiv sometimes not pos until 2 months, 6 months reported. Tested for herpes, chlamidia, GC, hpv, hepatitis? Do you know this guy? You seem to fear that he has had many other contacts. Perhaps you should discuss with him.
Dr. Kristin Stropnicky
Family Medicine 10 years experience
Retest at 3&6 months: For HIV, it can take up to 6 months after exposure to develop the antibodies that are detected by the test. So retesting is recommended usually at 3 and 6 months post-exposure. For syphilis, antibodies can take several weeks to be produced, so again, if you are concerned, another retest in the future may be indicated. Testing for other STDs such as chlamydia and gonorrhea is recommended also.

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Last updated Jun 28, 2016

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