The COVID-19 PCR swab tests directly detect the presence of the COVID-19 antigen in an individual and detects active COVID-19 infections. This is the globally accepted test standard for COVID-19.
The COVID-19 Serology (IgM) test detects the presence of antibodies to COVID-19 which is a marker of past infection. Individuals who have been infected with COVID-19 more than 10 to 14 days ago will have a positive serology test.