About Covid-19 Antigen Tests DOCS Medical has chosen the Quidel Sofia SARS Antigen test since June of 2020. This is a nasopharyngeal test and results are reported in 20 minutes. We have seen excellent results with this test. The Sofia SARS Antigen FIA was compared to a Reference Extracted RT-PCR assay. The Sofia SARS Antigen FIA was 99.5% agreement … Continue reading "Covid-19 Test Results".