A Rapid Antigen Test is a diagnostic tool used to quickly detect the presence of specific proteins from a virus, such as the SARS-CoV-2 virus responsible for COVID-19. These tests are designed to provide results within minutes, making them useful for screening in various settings, including hospitals and schools. The test typically involves taking a sample from the nose or throat using a swab. The sample is then mixed with a solution and applied to a test strip. If the virus proteins are present, a colored line appears, indicating a positive result. Rapid antigen tests are generally less sensitive than PCR tests, but they are faster and easier to administer.