It does not mean they are currently infected. The antibody instant COVID-19 test contains a conjugate pad with SARS-CoV-2 recombinant antigens, an IgG line coated with an anti-human IgM line, an IgM line coated with anti-human IgM, and a control line.. After the sample is placed inside the test cassette, the specimen will migrate by capillary action along with the cassette. However, all tests, including the COVID-19 antibody test, can give positive results that are incorrect (i.e., false positive results). Antibodies usually start developing within 1 to 3 weeks after infection. 12-14 Negative results suggest that a person has not been infected with SARS-CoV-2 or has been very recently infected (antibodies have not yet been produced). A negative test result with the Antibody Assay for SARS-CoV-2-specific antibodies does not rule out a SARS-CoV-2 infection. The Antibody Assay for SARS-CoV-2 is not a diagnostic test to determine if COVID-19 virus is present. In general, a positive antibody test is presumed to mean a person has been infected with SARS-CoV-2, the virus that causes COVID-19, at some point in the past. (Virus tests including the PCR/molecular test and the antigen test.) COVID-19 Antibody (IgG) Description The SARS-CoV-2 IgG assay is a qualitative test designed to detect IgG antibodies to the nucleocapsid protein of SARS-CoV-2 in serum and plasma from patients who are suspected of past coronavirus disease (COVID-19) or in serum and plasma of subjects that may have been infected by SARS-CoV-2. Covid-19 antibody tests can tell you if you have had a previous infection, but with varying degrees of accuracy. If your antibody test result was positive, this means that the test shows that you have COVID-19 antibodies in your blood. A negative test result means that the antibodies to the virus that causes COVID-19 were not found in your sample. Whether you test positive or negative for COVID-19 on a viral or an antibody test, you still should take steps to protect yourself and others . The two types of COVID-19 tests are a virus test and an antibody test. However, it is possible for this test to give a negative result that is incorrect (false negative) in some people. In most cases, exposure to the COVID-19 virus would have resulted in symptoms of an infection. Ongoing studies will eventually reveal more data on this. The level of immunity and how long immunity lasts are not yet known. What does it mean if I have a negative test result? An antibody test may not show if you have a current COVID-19 infection because it can take 1–3 weeks after infection for your body to make antibodies. A positive COVID-19 IgG antibody test means that you previously had or have been exposed to the virus that causes COVID-19, and that your immune system developed antibodies in response to it. It may also mean that you have some immunity. Low lymphocyte levels and high C-reactive protein levels have been associated with poor COVID-19 outcomes. This result means that you were likely infected with COVID-19 in the past. A COVID-19 antibody test can’t diagnose a current, active infection, but a viral test does. What does a positive antibody test mean? On the other hand, the PCR molecular test to diagnose COVID-19. But there's a lack of evidence on whether having antibodies means you're protected against reinfection with COVID-19. Instead, the COVID-19 antibody test shows if your body has mounted a response to the SARS-CoV-2 virus. At hospital admission, antibody levels were correlated with those of C-reactive protein (indicating inflammatory response) but not with lymphocyte counts (indicating immune response to infection). The timing and type of antibody test affects accuracy. That diagnosis should be based on a PCR (molecular) test. 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