evidence: Start here: There are tests that diagnose current infection and tests that show whether you previously had SARS-CoV-2, the virus that causes COVID-19. [...] Because this novel coronavirus is indeed novel, and COVID-19 is a new disease, information about available tests is incomplete and testing options keep changing. Tests vary in terms of accuracy, cost, recommended use for people of various ages, and convenience. This blog post reviews features of the major types of tests. For more detailed information on individual tests, check the FDA's updated list of authorized tests, which has links to the test makers' websites. [...] An antibody test can show if you have previously been infected with the COVID-19 virus.