Anonymous
Hi there

46 ago, I performed unprotected oral sex on a guy. Today, 46 days later I took a rapid test in an Aids centre. The blood was taken from my finger. It was negative. The worker in the centre told me it was a combo rapid test, but I should come back at 3 months.
Is a 46 day rapid test reliable? Is there something like a combo rapid test? I read such a test is not reliable concerning the 24antigen. Is that true?
What should I do?
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Anonymous
HI,

Thank you for contacting AIDS Vancouver, I will try and answer your questions as best I can.

Performing oral sex is a low risk exposure. There is a potential of HIV transmission because they involve the exchange of body fluids. There have been a few reports of infection attributed to these activities (usually under certain identifiable conditions).

It is great to hear you got tested, this is a positive first step. A rapid test is a great test since you can get results within minutes. It needs to be taken 4 weeks to 3 months post exposure ( although up to 95% of infection are detectable within 4-6 ). Most people develop detectable antibodies in 21-25 days. World Health Organization considers all test results conclusive at 3 months.

The are no combo Rapid tests. There is a 4th Generation aka DUO or COMBO test which looks at both the antibodies and P24 protein antigens.

The P24 Antigen Test is not accurate after 6 weeks. The reason for this is that the antigen on HIV that most commonly provokes an antibody response and once the immune system begins to produce antibodies to fight the virus, the P24 antigen levels drop off because they are no longer needed.

It sounds to me that what you had was the Rapid test, this is a very good test and is 99.6% accurate. To get a conclusive result on your test take the test three months post-exposure.

For further information you can find our webs[www.aidsvancouver.org](www.aidsvancouver.org)ite at http://www.aidsvancouver.org .

Best Wishes,

Renee

AIDS Vancouver Helpline Volunteer
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