0
Answer
HIV Duo Testing (ELISA IV), which detects the HIV-1-P24 antigen -- a definitive precursor of HIV -- has a superb success rate at as little as 7 days. However, a 28-day test is recommended, and apparently produces a higher degree of accuracy. Answer
HIV Duo detects both antibodies to HIV as well as p24, which is part of the virus itself. Antibodies are only formed after exposure to the antigen, so the antigen is detectable earlier than antibodies. This test reduces the window period significantly, and as the previous answer said, has a good sensitivity at even 7 days.
However, we must remember that each individual is different, and may "incubate" the virus for a different time to other people. In any particular individual, 4th generation ELISAs such as the Duo will only pick up antigen 7-10 days before the antibody appears. So those who would become positive on an antibody-only assay at 8 weeks will become positive on the Duo at 6.5-7 weeks. HIV first has to replicate locally before it spreads to the lymph nodes, and only after that does the major viraemia appear, and it is that viraemia that is detected by the p24 part of the assay. If the local replication occurs quickly, the person will be positive sooner.
There will always be the very small percentage who take longer.
There is one pont which is not logical.
So those who would become positive on an antibody-only assay at 8 weeks will become positive on the Duo at 6.5-7 weeks.
The antibody production is the host response to the antigen there may be differences in the time period of host response so it would be wrong to conclude the presence of antigen relative to antibody production.assume A and B are infected (read antigen present at point t(time)) A takes x period to seroconvert(antibody production) and B takes Y period to seroconvert.but both had antigen at t(time) hence it would be wrong to assume presence of antigen in A as x-c and B as Y-c (c is a constant). both would be different.
Visit: drtanandpartners.com
Wiki User
∙ 9y ago
Wiki User
∙ 13y agoNo you can not.
according to a CAP accredited lab the PCR or NAT tests are so sensitive that they can detect minute amounts of virus and can detct HIV after 48-72 hours post infection this is confirmed by many pathologists too.
the window period refers only to the antibody detection and not viral detection.
the advanced tests like NAT/PCR DUO(ultra sensitive) are so sensitive that 7 days is a very conservative period for detecting the viral particles.
The other window period by the governmental agencies and manufacturers/practitioners is a desperate attempt in liability protection and resource minimisation.
The window period has changed with advances in testing.
the governments across the world should make available these NAT/DUO tests at all public health depts to help early detection,which will aid the patient to get early treatment(better prognosis) and stop transmission.
Add your answer:
Earn +20 pts
Possible implantation bleeding 7 days ago for 2 days Preg test was neg today would that be accurate or does it take longer for hcg levels to show?
HCG levels begin building around 8 days past ovulation. For accurate results, it is best to wait until the day after you have missed your period.
How a person knows he or she got HIV?
Have an HIV antibody test anytime 8 weeks or after, post your last exposure to know your status. That is my friend the ONLY way to know
Hi Peter, I understa?
Hi Peter, I understand that you are very frightened. I would be happy to answer your question. Whether or not the negative result is reliable or not depends on what the test was. There are two ways to test for HIV: antibody and RNA levels. The most common and widespread way of testing for HIV involves testing the blood for levels of antibodies against HIV. If a person is exposed to HIV, his or her body will develop antibodies against the virus to try to fight it off, and these can be detected in the blood. Antibodies can take a relatively long time to be detected (2-8 weeks or even longer in some individuals). RNA testing measures HIV directly (the virus itself instead of the antibodies against it), and this can return positive much more quickly than antibody testing-typically, 9-11 days after HIV exposure. So, if you were exposed to HIV 11 days ago, you would most likely not demonstrate any antibodies until 2 weeks after the event at the earliest, but the virus would most likely be detectable by now. Since your doctors told you to "not worry", I suspect they checked your HIV RNA, not antibodies to HIV. For your peace of mind, you can ask your doctor the type of test that was done-if it was the antibody test, you will need to wait several months and be tested again. But if it directly tested for HIV and was negative at 11 days, odds are you are in the clear.
How old is Mrs.Whatsit?
2,379,152,497, 8 months, and 3 days exactly in OUR calendar, which isn't REALLY accurate!2,379,152,497 + 8 months + and 3 days
Can you pass a cocaine test 8 days after use?
yes
I have 8 days until my preiod how soon can you find out if im pregnant?
It will depend upon the pregnancy test. Some tests can predict up to five days before your expected period, while other's can only predict up to one day before your expected period. But you have to keep in mind that the sooner you take the pregnancy test, the less accurate your results will be. It is best to take the test 14 days after intercourse.
Can pregnancy test be positive 4 days after Conceiving?
10 to 14 days. However, it isn't conception that matters. It's implantation.
How could you test pregnancy before 8 days of next period?
Well, the soonest you can test for pregnancy with an at-home test is 5 days, even though it is not very accurate. I recommend for best results:Take the test in the morning, if possible, because your hCG (pregnancy hormone) levels are at it's highestDon't drink a bunch of fluids before taking the test because it will dilute your urine and can affect the resultsTake the test no more than 1-2 days before expected period. Although some test say that you can see results up to 5 days before your missed period, the percentage of accuracy is very low.urinate for as long as possible on the foam-like stripwait for the results!
Can pregnancy test show up in three weeks?
This depends if you are counting 3 weeks from the first day of your last period or 3 weeks from ovulation. The earliest you can take a pregnancy test is six days prior to your missed period. If you do not know when your period is due, then 8-9 days after ovulation. The time you can test also depends on the pregnancy test you are using, as some are more sensitive than others. "First Response" is the earliest to my knowledge. So, to answer your question, 3 weeks from from first day of last period is a tiny bit early for an accurate pregnancy test. In this case wait 1-2 days so you are closest to 6 days from your next period. However, if you are counting from ovulation, 3 weeks is more than long enough to take a pregnancy test and get an accurate result.
How many weeks before you can use pregnancy test?
8-10 days after ovulation
How late into pregnancy could your pregnancy tests results still come back negative?
You should wait to test at least 14 to 16 days after ovulation. However some women don't get accurate readings because they don't know when they ovulated, they ovulated late, or implantation was late. Most women are able to get an accurate home pregnancy test in 4 to 8 weeks of pregnancy. If you get negative home test and still feel that you may be pregnant you should see a Dr for a blood test as it can detect pregnancy much sooner.
Can you pass a urine test after 8 days for benzodiazepams?
If you haven't taken any benzodiazepams for eight days, you should pass a urine test.
