Antibodies are proteins produced by the immune system to fight infections such as viruses and can also help prevent new infections. After exposure to SARS-CoV-2 (COVID19), antibodies may take days or weeks to build up in the body and where their blood resides is uncertain.

To diagnose COVID-19, antibody tests do not detect the presence of the SARS-CoV-2 virus. This test can also produce false-positive results or negative test results in infected patients. They should not be used to determine whether you are currently infected or contagious. You can also get more information about antigen tests via

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Understand antibody test results

What is a positive antibody test?

You may have recently or previously had COVID19 if you tested positive for SARS-CoV-2 antibodies. There is also the possibility of a false-positive result, which is called a false positive.

Antibody tests can detect coronaviruses other than SARS-CoV-2, e.g. those that cause colds, leading to a false-positive test. When tests are carried out in populations with few cases of COVID-19 infection. This test was more effective in the group with a higher infection rate.

Does a positive antibody test mean I'm immunized against COVID19?

A positive antibody test does not mean you are immune to SARS-CoV-2 infection; It's not clear whether antibodies to SARS-CoV-2 will protect you from getting the disease again. It also doesn't say whether SARS-CoV-2 can be passed on to other people.