A result read before or after the specified timeframe may be incorrect. Read test results only within the amount of time specified in the manufacturer’s instructions.Have a timer ready because you may need to time several of the test steps.Do not open test devices or other test components until you are ready to start the testing process.Clean the countertop, table, or other surfaces where you will do the test.Do not use expired tests or test components that are damaged or appear discolored based on the manufacturer’s instructions. Store all test components according to the manufacturer’s instructions until ready for use.If you receive a positive result initially or after a repeat test, this means the test detected the SARS-CoV-2 virus and you most likely have COVID-19. Positive antigen test results are typically accurate. COVID-19 antigen tests may not detect the SARS-CoV-2 virus early in an infection, meaning testing soon after you were exposed to someone with COVID-19 could lead to a false-negative result (this means the test did not detect the virus when a person is infected), especially if you don't have symptoms. Most at-home COVID-19 antigen tests do not detect the SARS-CoV-2 virus as well as molecular tests, like PCR tests.
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