How do I know that my negative test result is accurate?

Every test has some room for error, known as “false negatives” or “false positives.” Tests that are granted Emergency Use Authorization (EUA) by the FDA must have a certain level of accuracy. There is also the possibility for user error. One way to be more sure about your negative test result is to take a second test at the same time or shortly after your first. A “false negative” could happen if you test too early after exposure to COVID-19; it takes 2-14 days after exposure for COVID-19 to be detected by tests. Testing 3-5 days after a known exposure is the general recommendation. If you are attending a multi-day event, you should test yourself multiple times during and after the event to make sure you are staying healthy.
Learn more about diagnostic test accuracy.