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Doctor insights on: Hiv Test Pcr

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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

Polymerase Chain Reaction (Definition)

Polymerase chain reaction is a method of finding a specific piece of dna and copying it over and over again until there is enough to study. The technique allows a scientist to detect very small amounts of dna in a swab sample then reproduce enough of it to study it. It is very sensisitive for detecting the presence of certain bacteria and is also used in doing other ...Read more


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I had unprotected oral sex on me I saw no blood I have no sores I am circumsized I have tooken a HIV dna pcr test at 18 days and a 46 also a 4 week and 6 week duo test and a 8 week rapid test am I ok?

I had unprotected oral sex  on me I saw no blood I have no sores I am circumsized I have tooken a HIV dna pcr test at 18 days and a 46 also a 4 week and 6 week duo test and a 8 week rapid test am I ok?

You're OK: Oral sex is safe sex for HIV, with no proved transmissions by fellatio from mouth to penis, only rare ones penis to oral. You didn't need testing on account of this event and for sure not the multiple expensive ones you had. But the results from that combination of tests are conclusive. For sure you didn't catch HIV during that exposure and no further testing is needed. Best wishes and stay safe! ...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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How reliable is PCR HIV test 1 month after an exposure?

Not the best test: The better test 1 month after exposure is either a standard serology (elisa with confirmatory western blot if positive) or a 4th generation antibody/antigen test. Hiv PCR (viral load) will usually be positive, but false positives and negatives can occur, so it's an imperfect diagnostic test. Viral load is used diagnostically mainly in people with symptoms of acute infection. ...Read more

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How accurate is a PCR Hiv test taken 14days past Exposure?

Not altogether: If you receive a negative result, follow it up in a few more weeks. But I am glad you are getting tested and I wish you the best. Whatever happens, I hope you have a memory of love that you will cherish forever, and that from now on, you have an experience that has helped you grow as a man. ...Read more

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I just had polymerase chain reaction (pcr) HIV test negative at 4 weeks 6 days, almost 5 weeks?

I just had polymerase chain reaction (pcr) HIV test negative at 4 weeks 6 days, almost 5 weeks?

Probably free: There are rare cases in which antibody testing has remained negative for several months, but you probably do not have hiv. If you are in a state of anxiety over this and can afford it, a PCR for the presence of viral RNA in your blood will solve this definitively. ...Read more

Dr. Lynne Weixel
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


Dr. Lisa Oldson
348 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