Doctor insights on:
Antigen And Antibody
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
Hepatitis AG & AB: The most common forms are hepa, hepb, and hepc. When testing for these forms you will do a blood test that will show antigens (ag) and/or antibodies (ab) for hepatitis. Hepa and hepc only have one ag which will result in one ab to fight if off. Hepb has both a surface ag (hbsag) and e ag (hbeag) resulting in hbsab, hbeab and hbcab (with results from infection of hepb). ...Read moreSee 1 more doctor answer
Is it possible to test positive for hiv 25 days after possible exposure? I had an antigen and antibodies test done which came back negative.
I got 3 HepB vacc. L8r a surface antigen & core antibody test both showed:non-reactive.B/C no antibodies present does this mean the vacc didn't take?
That's good: Hepatitis B surface antigen negative usually means a person is not carrying the virus. Hepatitis B core antibody negative usually means a person did not catch the virus in the past. Neither test is about the vaccine. There usually is a third test, if needed, to see if a person is immune due to taking the vaccine: Hepatitis B surface antibody. ...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?
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
Bloods done for HIV at GUM clinic. Would this test for antigens or antibodies or both? Tested 15 months out.
Doesn't matter: At 15 months, it doesn't matter. Any and all HIV tests that exist will detect HIV infection. If the results were negative, for sure you don't have HIV. That said, my understanding is that most UK GUM clinics routinely use the duo test (for antibody and antigen). But why don't you just call the clinic and ask? ...Read more
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