SARS-CoV-2 Antigen Test is used for detection of proteins from the virus that causes COVID-19. A positive result indicates the presence of viral antigens, implying current viral infection. Like RT-PCR test, the antigen test also detects the virus directly, and performs best when the person is tested in the early stages of infection with SARS-CoV-2. The antigen test is very specific, indicating that a positive result is highly accurate. Compared with RT-PCR test, the antigen test is much easier, affordable, and faster.
In addition, the antigen test can be performed at the point-of-care without the requirements for highly complex instruments and expertise.