Diagnostic tests are no longer in short supply, but questions about their accuracy are growing.
“You’re sampling blindly. You’re hoping you get the right spot. Then as the disease progresses, the virus might migrate down into your lungs,” Wells said, adding that once it’s in the lungs, that nasopharyngeal swab may not pick up any virus if it’s already been cleared from the throat.Another type of diagnostic test forgoes the uncomfortable swab altogether, and instead usesBut Wells said those tests could fare even worse.
Lead study author Dr. Lauren Kucirka, a medical resident at Johns Hopkins Medicine, said testing too early after exposure to the virus substantially raises the risk of a false negative. The article’s co-author, Dr. Priya Sampathkumar, an infectious disease specialist at the Mayo Clinic, used California as an example
Another type of COVID-19 diagnostic test, Abbott Labs’ popular ID NOW point-of-care test, has also come under fire in recent weeks, after the FDA issued an alert that it may not always be accurate.
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