hi thanks for your wonderful service and support i had a hiv blood test pcr rna at 7 days and p24 antigen test at 31 days after the possible transmission
both came negative and i have a rash on my back for 6 weeks i didnt have fever or any other symptoms if the rash is a symptoms of hiv my blood test at 31 days would be positive rite
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 you've had after a potential exposure. We're happy to answer your question for you.

Here is a bit of information on the tests you've had:

You should see in the charts that both tests are conclusive at 3 months post exposure. The test you had at 7 days was likely too soon to show your status in any meaningful way, while the test you had at 1 month is a pretty good indicator of your present status. You do still need to go for a test at 3 months post exposure to show your status conclusively, however.

As for the symptoms you're experiencing, we at AIDS Vancouver are not healthcare providers so cannot comment further on them. The only way to know your status conclusively, however, is to go for testing. This is because the symptoms of an HIV infection closely mimic the symptoms of many other common medical conditions. If you're concerned about any symptoms you're currently experiencing, we'd recommend you head to a physician for further assessment.

Thanks 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
NAAT (PCR RNA & DNA) Nucleic-Acid Amplification Testing (NAAT) looks for the genetic material of HIV and tests for it with a Polymerase Chain Reaction (PCR) test. 2-3 weeks post exposure NAAT tests generally take two forms: DNA PCR and RNA PCR tests. DNA PCR NAAT tests are usually used for screening babies of HIV+ mothers. RNA PCR NAAT tests are often used to screen blood or organ donations. Both measure the viral load of a positive person’s blood. Conclusive at 3 months post exposure.
4th Generation EIA Blood test that looks for antibodies AND p24 protein antigens. Commonly referred to as the "combination," "combo" or "DUO" test. Antigen (ag) test - P24 protein is detectable immediately after infection, & only for the first few weeks. The antibody (ab) test has a window period of 4-12 weeks. Most HIV specialists consider this test to be conclusive at 6 weeks. This is the screening methods used in Victoria and many parts of Ontario. Vancouver still uses the 3rd generation test unless it was a high risk exposure. The testing centre will evaluate people on a case by case basis to assess if this test would be helpful in early detection. Official HIV testing guidelines still recommend re-testing at 12 weeks for conclusive results. Accuracy is 99.9%