This TGA Approved COVID-19 Antigen Rapid Test is a lateral flow immunoassay based on the principle of double antibody sandwich technology. The SARS-CoV-2 nucleocapsid protein monoclonal antibody conjugated with colored microparticles is used as a detector and sprayed onto the conjugation pad. During the test, the SARS-CoV-2 antigen in the sample interacts with the SARS-CoV-2 antibody, which is conjugated with colored microparticles, creating an antigen-antibody-labeled complex. This complex migrates via capillary action on the membrane to the test line, where it is captured by the pre-coated monoclonal SARS-CoV-2 nucleocapsid protein antibody. A coloured test line (T) would be visible in the result window if SARS-CoV-2 antigens are present in the sample. The absence of the T-line indicates a negative result. The control line (C) is used as a procedural control and should always be displayed when the test procedure is being carried out properly.