I did a HIV 1 & 2 and P24 combo (CMIA) test after 84 days of possible HIV infection. I took another test a different lab (HIV 1/2 spot test screening) at 85 days. Both the result came out non-reactive.
Should I go for another test at 90 days or my tests are conclusive?
I recently had a TETANUS VACCINE after my tests. I found on the internet that TETANUS VACCINE can cause false positive in rare cases. I don't want to give myself tension by getting the false positive. Please walk me through all the tests that are not affected by TETANUS VACCINE in detection of HIV 1 &2. I want to relive myself from this HIV (1&2) tension.
In my home city, labs are offering only HIV 1 RNA QUANTITATIVE, REAL TIME PCR. Will it work? What about HIV 2?
Please help
Hi there, and thanks a lot for contacting the AIDS Vancouver Helpline for your HIV/AIDS related health information. It seems you're concerned about the accuracy of some HIV tests. We're happy to answer your question for you.

Here is a bit more information on the DUO or COMBO HIV test you've had:

You'll see that this test is considered conclusive at 3 months post exposure, as you are aware of. The tests you've had at 84 and 85 days are very good indicators of your present status, but you need to go back for confirmatory testing at 90 days to know your status conclusively.

As for the tetanus vaccine possibly effecting the results of your HIV test, this is not the case. Some conditions and medications can effect the results of HIV tests, but the tetanus vaccine is not one of them. This test is looking for specific HIV antigens, the presence of which would not be effected by the tetanus vaccine.

Thanks a lot for contacting the AIDS Vancouver Helpline with your question, we hope it has been answered fully.


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Test Name Method Window Period Conditions
4th Generation EIA Blood test that looks for antibodies AND p24 protein antigens. Commonly referred to as the "combination," "combo" or "DUO" test. P24 protein is detectable immediately after infection but only for the first few weeks. The antibody (ab) test has a window period of 4-12 weeks post exposure. This test is widely available in North America. Most HIV specialists consider this test to be conclusive at 6 weeks but official HIV testing guidelines still recommend re-testing at 12 weeks for conclusive results. Conclusive at 3 months post exposure. |