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Doctor insights on: Hiv 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 ...Read more

Dr. Austina Cho
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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My ELISA HIV test came up negative after 1month exposure. How accurate is this test?

My ELISA HIV test came up negative after 1month exposure. How accurate is this test?

90%: There's a period of time after a person is infected during which they won't test positive. This is called the “hiv window period.” The window period can be from 9 days to 3-6 months, depending on the person's body and on the HIV-test that's used. ...Read more

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According to WHO, 6 weeks HIV test is conclusive (unless I miss understood it) then why CDC recommends 3 to 6 months for conclusive results?

According to WHO, 6 weeks HIV test is conclusive (unless I miss understood it) then why CDC recommends 3 to 6 months for conclusive results?

The "Window Period": Window period is the time it takes lymphocytes to develop antibodies to an antigen. This is usually 4-6 weeks but can be as long as 3 months. By 3 months after exposure...97% of people will have antibodies to antigen. In rarer instances it may take up to 6 months to develop antibodies. After 6 months..99% of people exposed will have antibodies to viral antigens. Therefore the 3 to 6 months!!! ...Read more

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I did 4th Generation HIV test after around 4,5,6,7,8,9,10,11,12,14,15 weeks of an exposure. Is this 100% conclusive? can i get back safely to my wife

Sero-conversion: The whole concept of delayed sero-conversion dates back to old & sloppy tests. PCR testing now will show virus in the blood with or without antibodies. If you need to cling to the old adages...at 6 months..99.99% of the population will have developed antibodies after an exposure..thus the 6 month window. I believe a colleague of mine Lyssette Cardona, MD is in Dubai..she's one of the best!! ...Read more

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What is 4th gen hiv test window period for hiv-2 I had 7 negative hiv tests from week 4 up to week 19. Can i move on no matter how high risk it was ?

What is 4th gen hiv test window period for hiv-2
I had 7 negative hiv tests from week 4 up to week 19. Can i move on no matter how high risk it was ?

Window 4 weeks: Yes you can move on. The 4th generation HIV tests are conclusive any time 4 weeks or more after the last possible exposure. No matter how high the risk, all tests after 4 weeks were unnecessary. ...Read more

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Is it possible to have a false negative rapid HIV test well after window period (9 months after last possible exposure)? If so , why?

Is it possible to have a false negative rapid HIV test well after window period (9 months after last possible exposure)? If so , why?

Unlikely: When sufficient time has elapsed after one's last potential exposure, HIV tests are usually reliably positive if one is in fact infected. One has to be aware that the usual test looks for hiv-1, but there is also an hiv-2 which is far less common but could be in you and the standard test would not recognize it. ...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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What is the HIV antibody test window period?

What is the HIV antibody test window period?

HIV window: We used to say that the window was 30 days but the newer more sensitive laboratory 3rd elisa tests can detect antibody reliably at 15 days (some as early as 9 days) while 4th generation antigen/antibody tests can detect infection even earlier. ...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


Dr. Ed Friedlander
1,422 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