Rapid Tests are used as a serial screening tool whereby individuals test themselves 2 or 3 times a week to detect if they are an asymptomatic carrier of covid-19. These tests are most effective when you are infectious and are one more layer of peace of mind and safety.  Rapid antigen testing devices should only be used for screening purposes. Nucleic acid-based testing, also called molecular testing or PCR, is the gold standard to diagnose active COVID-19 infection in patients with symptoms. For more information about self-testing and antigen testing devices, please visit the Health Canada website here.