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Doctor insights on: Hiv P24 Antigen Test

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What is the window period for p42 antigen/ antibody dual 4th gen HIV test? And the window period for HIV RNA PCR test? When can it be conclusive?

What is the window period for p42 antigen/ antibody dual 4th gen HIV test? And the window period for HIV RNA PCR test? When can it be conclusive?

See below: Please consult this site for a detailed answer. Nucleic acid tests are conclusive about a month after acquiring infection. http://www.sfaf.org/hiv-info/testing/hiv-test-window-periods.html ...Read more

Dr. Barbara Lavi
16 doctors shared insights

Hiv (Definition)

Hiv infection is caused by a retrovirus....This retrovirus binds to CD4 cells (for the most part). You may detect the virus by several different methods. An elisa test (enzyme linked immunosorbent assay). You may also detect it by doing a test referred to as a western blot (a gel protein electrophoresis). Thirdly by pcr (polymerase chain reaction) which ...Read more


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Had protected vaginal sex with CSW. How reliable is negative HIV p24 antigen combo test at 20 days mark? Also, getting results tomorrow for HIV RNA PCR at 19 days. Will that be conclusive if negative?

Had protected vaginal sex with CSW. How reliable is negative HIV p24 antigen combo test at 20 days mark? Also, getting results tomorrow for HIV RNA PCR at 19 days. Will that be conclusive if negative?

Pretty reliable: most people who turn positive would be positive at least borderline by day 14-20. There are uncommon cases of over 1 month to turn positive. NOte that the incidence of this is far lower than the liklihood of someone Totally Lying about What They are Doing !. Oh, sorry, that's for the antibody. The antigen/other measures of virus should be done TOGETHER with antibody. REALLY low risk of false negat ...Read more

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How reliable is a p24 antigen HIV test a month after been exposed?

How reliable is a p24 antigen HIV test a month after been exposed?

Not widely used: The level of p24 antigen and the amount of virus (viral load) increase significantly soon after initial infection. It is during this time frame, before HIV antibody is produced, when the p24 test and the HIV antigen/antibody combination test are useful in helping to diagnose infection. About 2-8 weeks after exposure, antibodies to HIV are produced in response to the infection and remain detectable. ...Read more

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Hiv test antibody and p24 antigen(cmia) done after 5 months 15 days after possible exposure came out non reactive. is this result satisfactory. help?

HIV?: Very low likelihood of HIV infection with those test results. Greater than 97% of people are positive by 3 months and virtually all are positive at 6 months. ...Read more

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How reliable negative result of p24 antigen and hiv antibody test at 45 days? percent of people get accurate result on the said test by this period?

How reliable negative result of p24 antigen and hiv antibody test  at 45 days? percent of people get accurate result on the said test by this period?

No worries!: This combination of tests is 100% conclusive any time 4 weeks or more after the last possible exposure. Nobody with negative resutls at 45 days is later found to have HIV. So all is well; you can move on without worry. Best wishes and stay safe! ...Read more

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Took HIV Antibody 1&2 Test and P24 Antigen test 10 days after PEP. Results non-reactive. A bit early. All other blood panel metrics normal. Thoughts?

Took HIV Antibody 1&2 Test and P24 Antigen test 10 days after PEP. Results non-reactive. A bit early. All other blood panel metrics normal. Thoughts?

Not conclusive: These results are reassuring; it is unlikely you were infected. However, the results are not conclusive. Following PEP, it is necessary to test for HIV longer than otherwise, maybe up to 4 months. (PEP is great when needed, but it prolongs the time of uncertainty about whether infection occurred.) Discuss with the clinic or doctor who prescribed the PEP and follow his or her advice. ...Read more

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I want to test for HIV which test will give accurate result. Its been 6 weeks now after exposure used condom.Had a p24 antigen on 20th day its negtve?

I want to test for HIV which test will give accurate result. Its been 6 weeks now after exposure used condom.Had a p24 antigen on 20th day its negtve?

HIV RNA Test: The best and most accurate test is the HIV RNA pcr test. But, you wore a condom. The test will be negative. As you have been taught over and over and over here. Please do the test and then get on with the rest of your life. ...Read more

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Neg p24 antigen test and neg HIV1/2 antibody test at 11wks post exposure. Can I trust these blood tests and finally have some peace of mind? For HIV

Neg p24 antigen test and neg HIV1/2 antibody test at 11wks post exposure. Can I trust these blood tests and finally have some peace of mind? For HIV

You are fine: Please trust these results. I'm sorry you had a scare, but I hope that you will have confidence that you're not infected with HIV and that you will put this behind you. I also hope that you will treasure the memory of having shared love. Human love is never perfect and always involves risks. But I hope you'll find real joy with another person, and share safe intimacy when the time is right. ...Read more

Dr. Ed Friedlander
1,422 doctors shared insights

Human Immunodeficiency Virus (Definition)

Human immunodeficiency virus (HIV) is a lentivirus (a member of the retrovirus family) that causes acquired immunodeficiency syndrome (aids), [1][2] a condition in humans in which progressive failure of the immune system allows life-threatening opportunistic infections ...Read more


Antigen (Definition)

Antigens are chemicals which upon exposure to the surface or inside of the body, will cause a reaction term allergic. Many substances will do this and allergic response is the basis for immunological protection for ...Read more