Quantitative Viral Serology
A serology blood test is used to determine if there are certain antibodies, IgG or IgM, in your blood that react with certain substances called COVID-19 antigens. The presence of antibody indicates the patient has been infected or vaccinated. At this time, it is not known what proportion of the population has antibodies to COVID-19. When antibodies are found in your blood it is part of a picture that your physician can use to aid in determining whether you have had a COVID-19 infection or a response to a vaccine.

1-Why is serology testing important for COVID-19?