![]() Multiple negative test results increase the confidence that you are not infected with the virus that causes COVID-19. Follow FDA and manufacturer’s instructions, including for the number of times you may need to test. *Self-tests, or at-home tests, are usually antigen tests that can be taken anywhere without having to go to a specific testing site. Sometimes a follow-up NAAT may be recommended to confirm an antigen test result. To best detect infection, a negative antigen test should be repeated at least 48 hours apart (known as serial testing). A single, negative antigen test result does not rule out infection. They are less reliable than NAATs, especially for people who do not have symptoms. ![]() Antigen tests* are rapid tests which produce results in 15-30 minutes.Therefore, you should not use a NAAT if you have tested positive in the last 90 days. These tests detect viral genetic material, which may stay in your body for up to 90 days after you test positive. They are typically the most reliable tests for people with or without symptoms. NAATs, such as PCR-based tests, are most often performed in a laboratory.All tests should be performed following FDA’s requirements. In certain circumstances, one test type may be recommended over the other. There are two main types of viral tests: nucleic acid amplification tests (NAATs) and antigen tests. Viral tests look for a current infection with SARS-CoV-2, the virus that causes COVID-19, by testing specimens from your nose or mouth.
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