Doctor insights on:
Antigen Vs 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?
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
Varies: Most people will make detectable antibodies in about two weeks after receiving rh d positive blood, if the recipient is rh d negative. ...Read more
Form hybridoma: When an antigen is given to an animal, B cells in serum produce a polyvalent antibody prep. When antigen is given to an animal and spleen cells (B) are fused with malignant B cells, a hybrid clone is formed producing monoclonal antibodies to the specific protein antigen. ...Read more
Unclear question: Treatment with Rhogam can prevent development of antibodies to rh if treated within 72 hours of exposure. However, this is not a do it yourself issue and you must see your doctor or go an emergency department asap. ...Read more
They don't usually: Antibody does not usually kill an antigen but binds it. The attachment may then, under certain circumstances , triggers the release of certain mediators or the influx of body cells (cytotoxic lymphocytes, macrophage etc) to do the job of killing. This is a very simplistic answer to a complex question however. ...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 more
Hepb surface antigen positive, confirmatory test negative, antibody and core negative, should I worry?
Possibly: Do not understand how initial test was positive and "confirmatory" test negative. Need to repeat these, although you may be in the "window" period, when antigen is being consumed by forming antibody and neither is measurable. Wait 3 months and retest antibody titers. By then you may be hepb antibody and core antibody positive, in which case you are immune. ...Read more
I had risky sex exposure and 10.5 days after i had RNA and Duo Antigen/antibody test which both came back negative, is that conclusive?
Retest in a month: It takes a few weeks even for the modern tests to come back. I hope you turn out okay, that you'll love safely from now on, and that you'll cherish having shared love, imperfect as it may have been. Best wishes. ...Read more
What's the difference on Antibodies/Antigens on the exterior of the cell vs the interior while testing and worried about the sensitivity/accuracy?
Please Clarify: Your question is very vague. There are thousands of Antibodies and millions of Antigens..if not more. Which in specfic are you interested to find out about. Please think it through what exactly do you want to know? ...Read more
They work together.: Antibodies recognize proteins and complex carbohydrates in solutions (like blood) or surfaces of cells. It is part of the adaptive immune response that has memory from previous exposure (either from having disease, or, for example, immunization). Different types of antibodies have different functions. ...Read more
HIV: There is a chance that some individuals will take longer to develop detectable antibodies than the usual 2-8 weeks, therefore, if the initial negative HIV test was conducted within the first 3 months after possible exposure, repeat testing should be considered >3 months after the exposure occurred. ...Read more
Does the DNA/RNA store antigen/antibody information? or is this only on the outside of the cell (exterior)?
Great Question!: This is a big topic in the immunology field! Antigens tend to be stored in the DNA, but Antibodies are the product of many interactions between DNA, RNA and Proteins that we don't fully undestand. If you are realy intrested in this topic, start your studies in Molecular Biology and go from there!! ...Read more
What does it mean if "HEPATITIS B SURFACE ANTIBODY QL" is "borderline" but "HEPATITIS B SURFACE ANTIGEN" is "non-reactive"?
Uncertain.: Without the rest of your lab values, it is difficult to know for sure. These value suggest that you may have been exposed or vaccinated for hepatitis B in the past, but again we're working with incomplete information. You may speak with your physician who ordered the tests or call us at HealthTap Prime if you have the rest of the results. Good luck. ...Read more
What happens if HBsAG is positive,hbc antody positive ,hbe antibody positive ,hbe antigen not detected.am I hepatitis free?
Have hepatitis B, c?: HbsAg, is the antigen of the hepatitis B virus. You have antibodies to the core antigen of the virus (Hbc) and hepatitis e virus; absence of Hep e antigen means that you may have lost that virus. You were exposed to hepatitis C, or you have that infection too. See see a hepatologist (a gastroenterologist who has special interest/training in liver diseases. ...Read more
Did my HIV antibody-antigen combo test after 10 weeks of possible exposure came out negative do i need to retest or this test is satisfactory.
Recheck at 6 month: Given many variables, 10 weeks negative is good but not reliable. Both (a) check out/verify the false negative rate with the lab, given the test kits they use to do the testing (no test is 100% accurate in ruling-in or out plus actual accuracy involves additional issues, see: bayes' theorem) and recheck tests at 6 months after the possible exposure. ...Read more
Is a core positive antibody for hepetitis b is dangerous. Igm antibody negetive. Surface antigen negetive with surface antibody positive. Explain?
My hep b surface antigen is positive but conformation test is negative, also all other test hsbc antibody and core negative , is it a false report?
Hi please help, hepb surface antigen positive, hep b surface antigen confirmatory negative, antibody negative and anti core negative.What does it mean?
Hepatitis B testing: You should have it rechecked. Hbsag or surface antigen tests are the same, not like in HIV which has screening and confirmatory test. Normally, in the window period after an acute infection, all test for surface antigen or its antibodies are negative except for antibody to core antigen. Hbsag or surface antigen appears right after infection or exposure and disappears in recovery. ...Read more
There are DNA, Proteins, Antibody/Antigens. But what's used while detecting the presents of Toxins (ID's, drugs, chemicals,ect)?
Toxins: I am not sure I understand your question. If you have a certain toxin in mind that you would like to know how to detect, I recommend that you name that. There is direct and indirect toxin measurement, again depending on the toxin. ...Read more
Please find full updated list on all DNA, Antibodies, Antigens, and Proteins. Need text files for research projects. Links would help!!
NIH: AMA. Library of Congress- not this forum. ...Read more
Core ab +be. Igm -ve. Surface antigen -ve. Surface ab +ve. E antigen -ve. E antibody +be. I was vaccinated for hepetitis b in 1996.Explain.
If i had an HIV test 25 days after possible exposure and it came back negative is that pretty reliable? It was an antibody and antigen test
HIV testing: You should be followed up with a repeat test at 3 mos, but the test you had is fairly reliable by itself. The problem is the rare individual whose tests become positive later than the 25 period you mention. ...Read more