Antigen test kit Colloidal Gold is used for in vitro qualitative detection of the antigen of Nasal Swab,Nasopharyngeal swab,Oropharyngeal swab by double antibody-sandwich method and colloidal gold immunochromatography. Double antibody-sandwich method can ensure a low antibody cross reaction, effectively improve the sensitivity and specificity of the product and reduce false positive.It can be used for early screening of infection and is an effective supplement to nucleicacid (PCR)detection.