According to the FDA, a rapid test is used to diagnose COVID-19 at a testing site or doctor’s office within 15-30 minutes. A rapid test is usually a nasal swab that tests for antigens, or a specific part of the virus.  A PCR test is the most accurate test for COVID-19 that detects a virus’s genetic material and is usually a nasal swab or saliva test. Neither of these tests can determine if you have had COVID-19 in the past. For more information, visit the FDA’s testing page.