Expired COVID-19 tests may give inaccurate or invalid test results, and the FDA does not recommend using them. The parts of the test may break down over time, leading to inaccurate results. However, some manufacturers have collected more stability data, and some tests may have FDA-authorized extended expiration dates. If you have an expired test, you should check the FDA website to see if the expiration date has been extended. If the test has an extended expiration date, it should work and give accurate results. If the test has truly expired, the results it delivers cannot be trusted. It is important to note that expired tests may give false negative results, which could lead to the spread of the disease. Therefore, it is recommended to use non-expired tests to ensure accurate results.