Anonymous
I did an antibody test 7 days after exposure and a combination (antibody/p24 antigen) test 22 days after last exposure. They were both negative. My question is how accurate my second test is?
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Anonymous
Hi there and thank you for reaching out to AIDS Vancouver with your questions! We're happy to help.

Your first antibody test is not likely to be very accurate, since 7 days is quite early for detectable antibody production after an exposure. Your second test, however, is fairly accurate. 4th generation combo tests give fairly accurate results, upwards of 90% within 2-4 weeks of exposure. Most specialists in the world consider this test to be conclusive at 6 weeks post exposure, although Canadian guidelines still state 12 weeks as the official conclusive period. So it's a good idea to get another test just to make sure, but your results are unlikely to change.

I hope this helped! Please visit catie.ca for more information about HIV!

Sincerely,
Christina

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