Doctor insights on:
Hiv P24 Antigen Test
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?
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
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
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?
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
I had an sexual int. With an escort 7 months ago. I have last Anti Hiv 1/2+P24 Antigen test after after 7 month. My tests are negative. Am I free or not?
HIV: I know in the United States that the testing for occupational exposure has been initial 2, 4 and 6 months then no exposure assumed. If you are negative 7 months after exposure. You are negative and free. ...Read more
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
4th generation hiv test 13wks, 4days post possible hiv exposure, result=negative. No p24 antigen/antibody, could antibody develop at a later time?
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
No: Recheck it 3-6 months after the contact occurred. ...Read more
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?
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?
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
Hiv antibody test aftr 2 months is reliable? P24 antigen on 20th day post exposre-negative. I am in high stress.10 day remaing fr 2month. Used condom.
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 had sex. Used condom. Took p24 antigen on 18 day mark its negative. Took HIV duo 1& 2 antibody 4th gen at 8 weeks its non reactive. Do I need more test?
Stop worrying: You're very unlikely to get anything if you're wearing a condom, period. These tests are negative. The vast majority of men wouldn't even seek testing. Listen. You're 21 years old and you're a man now. I'm sorry that your (was it first?) experience of loving left you feeling like this. But you're not damaged / dirty either physically or spiritually by it. Talk with somebody wise -- maybe even dad. ...Read more
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
I have been exposed to HIV my blood work detects I have p24 antigen. Does this mean I have or will get HIV? I only have one partner.
Is HIV P24 antigen detectable 17-19 days after PEP? I have read that generally speaking it is detectable at 14 to 16 days on average. Thoughts?
That's about right: P24 can often be detected as early as 10-12 days after infection. But these figures are pretty good on average. ...Read more
What is the accuracy of p24 antigen and antibody HIV testing 4-6 weeks post PEP testing? For something incredibly minor, would this be reliable?
Simultaneous detection of p24 antigen and antibody HIV 1and 2 cmia = 4th generation ag ab combo? Which means u have been tested for p24 /antibody?
Yes and no...: The antibody portion of the test detects antibody to several HIV antigens in addition to p24. Probably you do have antibody to p24, but the test doesn't distinguish these various types. And it doesn matter. If your test is negative and it has been 4 weeks or more after your last possible exposure to HIV, the result is conclusive. ...Read more
Is it possible to have an HIV p24 antigen, HIV antibody, and HIV PCR accurate 5 weeks after exposure?
Yes in part: The tests that detect actual HIV virus, such a the HIV viral load (pcr), will likely be positive 5 weeks after an exposure that results in transmission of hiv. The HIV antibody test may still be undetectable. So, if you are very worried about acute hiv, it is very important to discuss with your health provider so they do the right tests. ...Read more
I had protected sex with a sex worker a month ago I got loose motions for a week and I am afraid of HIV I did a p24 antigen at 20 day mark its negatve?
I am sorry you did not use a condom when you had your sexual encounter. But, loose stools are in no way any indication of HIV or any other std. Your HIV test was done too soon to be accurate or valid.
Remember there are twelve common stds. Five of them are potentially life threatening. Worrying just about HIV is really missing the gravity of the situation. ...Read more
Low risk exposure. Tested with the p24 antigen on week 1, 3, 4 weeks and DNA hiv pcr at week 6 all negative.4 months elisa and negative. Conclusive?
Is it possible to hav all 3 - P24 antigen, HIV antibodies & HIV DNA undetectable at 4 MONTHS of risky exposure? Did 4th gen (Ab/Ag) & PCR DNA together
Get over it, Bill: You are not infected. I'm glad. You need to find a way of getting these obsessive thoughts out of your head, for your sake and the sake of those who love you. Get on with your life, a better and more mature man for what you went through. ...Read more
Can you get tested positive for the std, HIV using the p24 antigen & then if those results are received within the 3 day window of exposure go on pep?
I had sex for 1st tym with a sex worker used condom symtom. Weakness had loose stool now ok. Had p24 antigen on 20 day mark its negative afraid of hiv?
You used a condom: You used a condom. Your risk is only in your brain. You did not get hiv. I am going to be very frank. This is paranoia and guilt. There is no risk here for hiv. If I was your doctor I would do one more test in another month or two but would refuse any more tests. If there is a way you can get over your guilt then that would be the healthiest thing you can do. You do not have hiv. ...Read more
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
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
Human immunodeficiency virus (HIV) is a lentivirus (a member of the retrovirus family) that causes acquired immunodeficiency syndrome (aids),  a condition in humans in which progressive failure of the immune system allows life-threatening opportunistic infections ...Read more