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Doctor insights on: Hiv Test Reliability After 6 Weeks Antigen Duo

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Dr. Sewa Legha
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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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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Can I forget about HIV based on my 4th Gen HIV test (hiv1/2 and antigen) negative at 86 days after unfortunate incident? Learnt my lesson, thanks

Can I forget about HIV based on my 4th Gen HIV test (hiv1/2 and antigen) negative at 86 days after unfortunate incident? Learnt my lesson, thanks

I don't think so: The 4th generation HIV tests dentify acute infection through their ability to detect HIV-1 p24 antigens. However, I do not believe improved detection of early infection necessarily eliminates the chances that it may take someone longer than 3 months to test positive. 97% of infected individuals will test positive at 3 months, but to make sure you are not in the 3%, a test a 6 months is advised ...Read more

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For immune disorder is it required HIV test at 6 months? If the test is 4th gen, it should detct antigens if not the antibodies b by 3 months atlest

For immune disorder is it required HIV test at 6 months? If the test is 4th gen, it should detct antigens if not the antibodies b by 3 months atlest

? Status: Having an immune disorder does not mean you have to have an HIV test but if you are having unprotected sex or with multiple partners, then absolutely! The 4th gen HIV test detects HIV much sooner than 3 months...days to weeks because as you correctly stated, it detects the antigen but also the antibody. With an immune disorder, it may take longer to mount an immune response. 4th gen is preferred. ...Read more

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If I had an HIV test 25 days after possible exposure and it came back negative is that pretty reliable? It was an antibody and antigen test

If I had an HIV test 25 days after possible exposure and it came back negative is that pretty reliable? It was an antibody and antigen test

HIV testing: You should be followed up with a repeat test at 3 mos, but the test you had is fairly reliable by itself. The problem is the rare individual whose tests become positive later than the 25 period you mention. ...Read more

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Will a 4th gen hiv test detect hiv-2 antigens? I had some exposures with an african man. Last test at 18 week ag/ab. When will hiv 2 be conclusive?

Will a 4th gen hiv test detect hiv-2 antigens? I had some exposures with an african man. Last test at 18 week ag/ab. When will hiv 2 be conclusive?

Yes: All 4th gen HIV serologic test approved by the CDC will detect HIV 1 and HIV 2 infection.
If negative at 18 weeks, you most likely don't have HIV infection. ...Read more

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4th generation HIV test was neg, for antibodies and reactive for antigens. RNA test was negative. Am I now confirmed negative for HIV?

4th generation HIV test was neg, for antibodies and reactive for antigens. RNA test was negative. Am I now confirmed negative for HIV?

HIV testing: F of unknown age, sexual and medical history notes: 4th generation HIV test was neg, for antibodies and reactive for antigens. RNA test was negative. Am I now confirmed negative for HIV? ANS: Depends on the prevalence of HIV in your area, how recent an infection might have been acquired & lab error. If exposure to HIV likely would retest n 3 months but discuss with team doing testing. ...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 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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Is Hiv test after 5 months 20 days after exposure conclusive or retest is required. The result was non reactive and method antibody antigen combo (CMIA?

At this point: You're basically at the six month mark and more than 99% of persons with a HIV exposure, if they are going to be HIV (+) will test positive at this point. Your negative testing has greater certainty that you are not going to develop HIV positivity. ...Read more

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What are the odds of having a faulty HIV test? This includes antigen, PCR RNA tests, and antibody tests.

What are the odds of having a faulty HIV test? This includes antigen, PCR RNA tests, and antibody tests.

HIV testing...: 4th gen HIV testing and other tests are all fairly accurate. If there are concerns they can be repeated. If negative results 6 months after concerning exposure it is highly unlikely that results are inaccurate. Talk to your doctor about results if you are concerned and always remember to limit your risks with future sexual encounters: use protection, avoid high risk scenerios ...Read more

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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?

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

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What's the difference between HIV antibodies test and HIV antigen test? Because I had negative HIV 1/2 antibodies so does that mean I need a retest?

Possibly re-test: Once an individual has been exposed to an HI virus and its several antigens that individual's body produces anti bodies. After exposure it takes around 2 months for the antibodies to appear. So if the exposure was within two months, the antibody test needs to be repeated. If the antibody test is positive, tests for antigens need to be done, to confirm that the antibody test is not falsely pos. ...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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After how much time cmia test which is antibody & antigen combo test for HIV is conclusive mine came out negivite after 5 months 15 days. Advice please?

Negative: You do not have HIV. Your test would be accurate easily by week twelve post exposure. The test is valid and you do not have HIV. ...Read more

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What does meaning of HIV 1/2 antibodies NEG. Does mean the test checks for both antibodies&antigens as well? What is common test for HIV in pregnancy?

HIV testing: It is recommended that all women be tested for HIV during pregnancy. The test that is done is usually an Elisa antibody test. They usually test for HIV type 1 and HIV type 2. Again these are antibody tests-- not antigen tests. ...Read more

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How accurate is DUO hiv test after 10 weeks?

About 95%: The specificity of a negative DUO HIV test is 100% after 12 weeks of possible exposure. After 10 weeks, a negative DUO HIV test test indicates that there a 95% chance that the person is HIV negative. However, a small percentage of people exposed (5%) will have antibodies form up to 12 weeks after exposure. ...Read more

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What's the accuracy of DUO HIV test after 10 days?

Around 50%: Roughly half of newly infected people would have a positive duo test at 10 days. If at truly high risk, like unprotected sex with a known infected partner, ask about an RNA test for the virus. However, heterosexually acquired HIV remains quite rare in the UK. If at lower risk, have another duo test at 28 days, which will be conclusive. Or get expert advice at an NHS GUM clinic. Good luck! ...Read more

Dr. Dominic Riganotti
376 Doctors shared insights

Hiv Test (Definition)

There are several ways to detect the HIV virus. The first is by antibodies. This includes eia (enzyme immuno assay). The rapid HIV tests are these types. The second way detects proteins on the viral coat (western blot). This is a gel plate electrophoresis. Thirdly there is pcr (polymerase chain reaction). This detects and amplifies dna allowing a viral ...Read more


Dr. Ed Friedlander
1,487 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