At-Home COVID-19 Tests Expire. Here's What to Know About Yours
. Dr. Ulysses Wu, system director of infectious diseases at Connecticut’s Hartford HealthCare, agrees it’s best to be cautious, because you may not get accurate results if you use an expired test. “You’re more likely to have false negatives rather than false positives, but that false negative could give a false sense of security when you actually are positive for COVID,” he says.
Since diagnostic expiration dates are a “moving target,” it’s possible that your test actually lasts longer than the box suggests. But, Wu says, “I would just follow [the latest] expiration date and if you really have a concern or you don’t want to throw it away, you can always call the company.”Time isn’t the only thing that can affect the quality of a COVID-19 test. Moisture and extreme temperatures can also impair its accuracy, Wu says.
Extreme cold is also something to avoid. When the U.S. government first began distributing free at-home test kits this past winter, some people were concerned that the liquid reagents
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