![]() ![]() If you are in certain high-risk settings, you may need to test as part of a screening testing program. ![]() If you test too early, you may have an inaccurate result. If you were exposed to someone who has COVID-19 and you do not have symptoms, wait at least 5 full days after your exposure before testing.If you have symptoms, test immediately and then test again per the instructions if your first result is negative.Understanding COVID-19 Infection and the Risk of Spreading the Virus.Step-by-Step Guide: When to Test and What Your At-Home COVID-19 Antigen Test Results Mean.What At-home COVID-19 Antigen Tests Do Not Tell You.What Your At-Home OTC COVID-19 Test Result Means.This means people who receive a negative test result should use multiple tests over a certain period, testing at least twice over three days if they have symptoms and at least three times over five days if they do not have symptoms. Currently, all at-home COVID-19 antigen tests that are FDA-authorized are authorized for repeat testing, also called serial testing. This is especially true early in an infection or in people who do not have COVID-19 symptoms. At-home COVID-19 antigen tests are less likely to detect the SARS-CoV-2 virus than molecular tests, such as polymerase chain reaction (PCR) tests and other nucleic acid amplification tests (NAATs), which detect genetic material called RNA from the virus. At-home over-the-counter (OTC) COVID-19 antigen tests, often referred to as rapid tests, detect proteins called antigens from SARS-CoV-2, the virus that causes COVID-19. ![]()
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