COVID-19 Ag Test is the chromatographic assay test used for qualitative detection of the COVID-19 nucleoprotein antigen in nasal swab specimen from symptomatic and asymptomatic suspected patients may infected COVID-19. It is intended to be used for self- testing. When testing, the COVID-19 antigen in the sample combined with the colloidal gold-labeled COVID-19 monoclonal antibody to form a complex, which was then combined with the COVID-19 monoclonal antibody coated in the Test line during chromatography, at this time there is one red line in the Test area.