A new study is raising questions about the accuracy of a coronavirus test that is capable of producing results in less than 15 minutes, according to new research reported by NPR.

The Abbott ID NOW COVID-19 test received emergency use authorization from the U.S. Food and Drug Administration (FDA) last month in an effort to ramp up coronavirus testing in the country, and is touted as being able to deliver positive results in as little as five minutes and negative results in 13 minutes.

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But an unpublished study by researchers at the Cleveland Clinic is questioning how accurate the quick tests are. Researchers tested 239 specimens known to contain coronavirus using five of the most commonly used tests, including the Abbott ID NOW, and found the ID NOW only detected the virus in 85.2 percent of samples. That means it had a false-negative rate of 14.8 percent.

“So that means if you had 100 patients that were positive, 15 percent of those patients would be falsely called negative. They’d be told that they’re negative for COVID when they’re really positive,” Gary Procop, who heads the COVID-19 testing at the Cleveland Clinic and authored the study, told NPR in an interview.

Procop said such tests should be at least 95 percent reliable.

The study has yet to be published and has not been peer-reviewed.

Abbott Laboratories defended the test in a statement to NPR, saying the ID NOW performs as expected and the company has “confidence in the performance of the test.”

Abbott said problems with the test could stem from samples stored in a special solution known as viral transport media before being tested, instead of being inserted directly into the ID NOW testing machine, NPR reports. The company recently instructed users to only test samples put directly into the machines.

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Procop acknowledged the samples in the study were stored in viral transport media before they were tested, but said Abbott should prove with data this could affect how accurate the tests are. Procop said his hospital has stopped using the test to screen patients.

Other researchers said all tests can produce false-negatives, especially if samples are not collected properly or at a time when a patient doesn’t have detectable levels of virus in their bodies at the time.

Abbott is currently shipping 50,000 coronavirus tests daily for use on 18,000 ID NOW testing machines in doctors’ offices, clinics and hospitals around the country, according to NPR. The company is aiming to increase that to at least 2 million every month by June.

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