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Doctor insights on: Hiv Antigen Test Conclusive After 3 Months

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I had a hiv duo test at 10 days post exposure. I had read that antigens would be detected from 10 days? Although not conclusive can I feel reassured?

I had a hiv duo test at 10 days post exposure. I had read that antigens would be detected from 10 days? Although not conclusive can I feel reassured?

Slightly reassured: Ten days is a bit too soon. Probably about half of newly infected persons would test postive by that time with the 4th generation (antigen-antibody, "duo") test, so it's slightly reassuring. The test probably is 90% valid by 3 weeks and is conclusive for sure at 4+ weeks. ...Read more

Dr. William Singer
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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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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How accurate is the HIV antibody/antigen blood test at 8 weeks after exposure? Conclusive?

How accurate is the HIV antibody/antigen blood test at 8 weeks after exposure? Conclusive?

Test accuracy: Every test we do has a margin of error, due to both the nature of the test itself or how people behave when they collect samples, and the biologic variation between people. That said, the antibody tests for HIV perform quite well and in the setting of a suspect exposure are largely conclusive. However, the nucleic acid tests are far more specific than antibody-based tests can be. ...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?

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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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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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?

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 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

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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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I have tested negative for HIV on HIV duo antigen antibody test after 66 days is it accurate?

I have tested negative for HIV on HIV duo antigen antibody test after 66 days is it accurate?

HIV: There is a chance that some individuals will take longer to develop detectable antibodies than the usual 2-8 weeks, therefore, if the initial negative HIV test was conducted within the first 3 months after possible exposure, repeat testing should be considered >3 months after the exposure occurred. ...Read more

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Is it possible to test positive for hiv 25 days after possible exposure? I had an antigen and antibodies test done which came back negative.

Is it possible to test positive for hiv 25 days after possible exposure? I had an antigen and antibodies test done which came back negative.

Too soon to rule out: A negative result at this stage does not exclude HIV infection. It some times take unto a year for antibody test to turn positive. You should get HIV nucleic acid test done about 3 months after the exposure and if that is negative you are essentially without HIV. ...Read more

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Did my HIV antibody-antigen combo test after 10 weeks of possible exposure came out negative do I need to retest or this test is satisfactory.

Recheck at 6 month: Given many variables, 10 weeks negative is good but not reliable. Both (a) check out/verify the false negative rate with the lab, given the test kits they use to do the testing (no test is 100% accurate in ruling-in or out plus actual accuracy involves additional issues, see: bayes' theorem) and recheck tests at 6 months after the possible exposure. ...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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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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Does Hiv 1-2 Antibody and antigen test after 11 years of exposure gives current Hiv status accurate? If results are negative for 2 times sametype test

Worried?: If I understand you correctly and it's been 11 years since exposure then you have nothing to worry about. After 2 negative tests done at the appropriate times. On the other hand if you have been having ongoing exposures for 11 years that's a different story. ...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

? 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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I tested HIV negative using 4th gen test kits (antibodies and antigen) 14 days after exposure. Am I safe?

Too soon to know: It is good that the test was negative. You should repeat the test at 3 and 6 months after exposure.
For good health - Have a diet rich in fresh vegetables, fruits, whole grains, milk and milk products, nuts, beans, legumes, lentils and small amounts of lean meats. Avoid saturated fats. Drink enough water daily, so that your urine is mostly colorless. Exercise at least 150 minutes/week and increase the intensity of exercise gradually. Do not use tobacco, alcohol, weed or street drugs in any form.
Practice safe sex, if you have sex. ...Read more

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Which is more reliable, an HIV duo test (antibody/antigen) at 30 days or a rapid result finger prick antibody test at 7 weeks?

HIV: HIV testing should be done repeatedly up to 3 months, but some would recommend longer. The best test would be a PCR for HIV RNA, but this is expensive. The duo test checks for p24 antigen and antibody and should be positive in most people at 30 days, but there are rare instances of false-negative results. The question about which is best cannot be answered and is irrelevant. ...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?

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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2 weeks after exposure had real time pcr hiv (result:negative) 4 weeks after exposure hiv duo antigen/antibody (result:negative) Conclusive?

2 weeks after exposure had real time pcr hiv (result:negative) 4 weeks after exposure hiv duo antigen/antibody (result:negative) Conclusive?

Not yet: Get a HIV nucleic acid test about 6 months after exposure.
Wish you good health!
For good health - Have a diet rich in fresh vegetables, fruits, whole grains, milk and milk products, nuts, beans, legumes, lentils and small amounts of lean meats. Avoid saturated fats. Drink enough water daily, so that your urine is mostly colorless. Exercise at least 150 minutes/week and increase the intensity of exercise gradually. Do not use tobacco, alcohol, weed or street drugs in any form.
Practice safe sex, if you have sex. ...Read more

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4th generation hiv test 13wks, 4days post possible hiv exposure, result=negative. No p24 antigen/antibody, could antibody develop at a later time?

Some times: To be safe, get a HIV nucleic acid test at 6 months after exposure.
Wish you good health! - Have a diet rich in fresh vegetables, fruits, whole grains, milk and milk products, nuts, beans, legumes, lentils and small amounts of lean meats. Avoid saturated fats. Drink enough water daily, so that your urine is mostly colorless. Exercise at least 150 minutes/week and increase the intensity of exercise gradually. Do not use tobacco, alcohol, weed or street drugs in any form.
Practice safe sex, if you have sex. ...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

Dr. Ed Friedlander
1,496 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