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p24 test info?
      #187272 - 04/20/06 10:06 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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Re: p24 test info? new
      #187292 - 04/20/06 11:39 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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Re: p24 test info? new
      #187309 - 04/21/06 02:28 AM

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.

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Re: p24 test info? new
      #187326 - 04/21/06 09:47 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:

tanti saluti

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