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Doctor insights on: Antigen And Antibody

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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

Antigen (Definition)

Antigens are chemicals which upon exposure to the surface or inside of the body, will cause a reaction term allergic. Many substances will do this and allergic response is the basis for immunological protection for ...Read more


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What are antigens and antibodies, in relation to hepatitis?

What are antigens and antibodies, in relation to hepatitis?

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 more

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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.

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.

Too soon to rule out: A negative result at this stage does not exclude HIV infection. It some times take unto a year for antibody test to turn positive. You should get HIV nucleic acid test done about 3 months after the exposure and if that is negative you are essentially without HIV. ...Read more

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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?

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

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Simultaneous detection of p24 antigen and antibody HIV 1and 2 cmia = 4th generation ag ab combo? Which means u have been tested for p24 /antibody ?

Simultaneous detection of p24 antigen and antibody HIV 1and 2 cmia = 4th generation ag ab combo?  Which means u have been tested for p24 /antibody ?

Yes and no...: The antibody portion of the test detects antibody to several HIV antigens in addition to p24. Probably you do have antibody to p24, but the test doesn't distinguish these various types. And it doesn matter. If your test is negative and it has been 4 weeks or more after your last possible exposure to HIV, the result is conclusive. ...Read more

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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?

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?

HIV nucleic acid: The antigen antibody combo tests are quite good. But you should repeat the test at three months. At three months, if you get a HIV nucleic acid test and that is negative, you will more sure of the result. ...Read more

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Antibody (Definition)

An antibody is a protein the body's immune system makes to identify potentially harmful substances in the body. Antibodies attach to the substance on a molecular level and mark it so the immune ...Read more