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A member asked:
Is the prozone effect with an rpr lab test common? and does the prozone effect also occur with an hiv 1/2 ab lab test? negative for hiv ab at 14 weeks and had a negative rpr at 17 weeks?
2 doctors weighed in across 2 answers
The prozone effect causes false negative tests in secondary syphilis, so if you are concerned about recent exposure (primary syphilis) it is not a factor. There is no reported prozone effect with HIV testing. You should be able to rely on your negative tests.
Answered 11/2/2022
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Prozone effect in RPR can occur in secondary syphilis. Your negative result is unlikely to be due to prozone. Prozone is not relevant for HIV testing. Quit worrying about STDs. For your peace of mind you may repeat the test at 6 months after the exposure.
Answered 11/2/2022
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Related Questions
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Is Syphilis RPR and HIV 4th Gen 1/2 test negative after 8 weeks post exposure conclusive?
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Hi Tested negative for syphilis 52 days after risk with wr+rpr. And negative with Veda Lab rapid test 9 and 12 weeks after risk. Are rapid test after 12 weeks conclusive?
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I tested neg. for HIV AB with a lab based test at 14 wks past possible exposure, along with a negative RPR lab test at 17 wks past possible exposure. Partner had neg RPR & hiv AG/AB lab test 8 weeks after our encounter. Can I be sure Im neg for both?
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