Antigen Testing - results within 20 min
Antigen tests detect proteins on the surface of a virus and can provide very quick results, usually within 20 to 30 min. The test uses a nasal swab to collect a sample of respiratory fluid. However, unlike the PCR, which is the gold standard for accuracy and reliability, an antigen test can be less accurate. Antigen tests have an increased chance of showing a false-negative result, which means you can test negative, but actually have the virus. Depending on the situation, your doctor may have you take a PCR test if you get a negative antigen test result.