Livzon Rapid Test for SARS-CoV-2 Antigen (Lateral Flow) Livzon Rapid Test for SARS-CoV-2 Antigen (Lateral Flow) is used for in vitro qualitative detection of SARS-CoV-2 nucleocapsid antigen in nasopharyngeal swabs, oropharyngeal swabs and nasal swabs from individuals who are suspected of SARS-CoV-2 by their healthcare provider within the first seven days of symptom onset.