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Doctor insights on: Hiv Pcr Test Window Period

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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

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!

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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

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Does hcv coinfection expand only window period for antibody tests of hiv? Or does it have any affection to window period or accuracy of hiv pcr test?

Does hcv coinfection expand only window period for antibody tests of hiv? Or does it have any affection to window period or accuracy of hiv pcr test?

Worse outcome: Coinfection with Hep C and HIV is worse than either infection alone. Window period is a minor issue compared to severity of disease. Window period can be addressed by nucleic acid tests rather than relying in antibodies.

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If the HIV dna/pcr test is used for early detection, is it more or less sensitive between the 3-6 month period?

HIV PCR Test: This test is 100% accurate fourteen to twenty-one days after exposure. It does not need to be repeated after that if you are negative.

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What is the window period for Hiv RNA real time PCR quantitative test?

1-2 weeks: The HIV RNA should be positive within a couple if weeks of infection if not sooner.

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How reliable is the PCR test for hiv?

How reliable is the PCR test for hiv?

Serology better: The pcr (viral load) is generally not recommended as a diagnostic test; it's used in people who are already known to have HIV to monitor therapy. The HIV serology (antibody test) is preferred for diagnosis, as pcr is more subject to false positives and false negatives. However, pcr can be used to diagnose acute retroviral syndrome (primary infection). It should be very high at that stage.

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What is sensitivity and spesifity of the HIV / aids PCR test?

What is sensitivity and spesifity of the HIV / aids PCR test?

High: Since the test is looking for the virus itself it is very specific. There should be no false positives of titers that are significantly above the minimum of detection (of course some human error is always possible). Similarly, since it amplifies any detected viral RNA a million-fold, it is also very sensitive.

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How soon can someone get a PCR test for HIV done after an exposure?

How soon can someone get a PCR test for HIV done after an exposure?

About 2 wks-3mos.: Antibodies to HIV appear as early as 2 weeks after infection, and seldom take longer than 3 months. Pcr can be done in days or weeeks after exposure, but is usually done after elisa and western blot since it is expensive and requires technical skill.

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How accurate is PCR test for HIV after the 1st and 2nd week of exposure?

Likely to be neg: It takes about 25 days following exposure for the hin nat to become positive. If positive, it is nearly 100% accurate. Negative test does not exclude HIV in the body.

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How accurate is a HIV RNA PCR test taken 72 hours after last sexual contact?

How accurate is a HIV RNA PCR test taken 72 hours after last sexual contact?

Not accurate: It will not be accurate for current sexual encounter. It will give you a base line response for prior sexual encounters. If you are concerned about current experience, you can test in 1 month and then again in 6 months.

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I was told by lab that hiv RNA pcr test is accurate after 72 hours, was I lied to?

72 hr is too soon: This test takes a few days to become positive; 72 hr is too soon. Probably no intentional lying; more likely miscommunication or misunderstanding. In any case, DNA testing (RNA, DNA, PCR, etc) is never enough to diagnose new HIV infection; also need an antibody or antibody/antigen test. Best test (s) depends a lot on nature of exposure. See doctor/clinic experienced in HIV prevention & diagnosis.

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I would like to know where is possible to do the HIV PCR test if you don't have a primary doctor?

Online or in clinic: There are a number of online testing services where you purchase the lab order online then have the test at a local lab. Www. Stdtestexpress. Com is one of these. Major cities tend to have many free std clinics that can do testing for you - usually takes a google search to find out where they are though.

Dr. Shari Jackson
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. Ed Friedlander
1,478 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