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HIV Transmission and Education >> Am I Infected?

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Anonymous
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p24 test info?
      #187272 - 04/20/06 06:06 PM

So my docter recommended that I get a p24 antigen test 10 days after a possible exposure. Does anyone know exactly how accurate the test is and what the window period for that specific test is? I'll get my results any day now but and I plan on getting an antibody test at 3 months, but I'd still like to know the efficiency of the p24 so at least if it's negative I'll be able to relax for a while. Thanks.

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Anonymous
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Re: p24 test info? new
      #187292 - 04/20/06 07:39 PM

The P24 antigen shows up before antibodies develop. So it can detect an infection sooner. Mass. uses the 4th generation test which is a combination p24 and ELISA and that test is considered conclusive at 6 weeks.

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JonCage
Master

Reged: 04/13/06
Posts: 130
Re: p24 test info? new
      #187309 - 04/20/06 10:28 PM

P24 testing is used to detect particles of HIV from a recent infection before antibodies are produced. Blood banks also use it for screening donations.

P24 test are most reliable within 3 weeks of exposure so your Doctor's recommendation for the test at 10 days is accurate.

You need to know that these test are not for diagnoses purposes and a negative test will have to be followed by an ELISA at 3 months for a conclusive result.

--------------------
Red like love, as a symbol of passion and tolerance towards those affected

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Anonymous
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Re: p24 test info? new
      #187326 - 04/21/06 05:47 AM

Mass is not using 4th generation ELISA tests.

They however find 6 weeks to be enough even without p24 antigen.

The sensitivity of p24 tests are discussed and studies showed a sensitivity of up to 79%. specifity however is close to 100%.

See link: here: http://www.medscape.com/viewarticle/438306

tanti saluti





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