Inaccurate results from rapid COVID-19 tests raise concerns about widespread screening

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As companies and universities create their own strategies to widely test employees and students, experts warn confusion over conflicting results is inevitable.

Quidel, Vermont spar over results

The state Health Department said it could confirm just four cases from the Manchester clinic. The state set up a pop-up clinic to test hundreds of others before concluding there were no signs of an outbreak. Vermont Health Commissioner Mark Levine said Friday it was inappropriate for the Quidel executive to question the accuracy of the state's PCR test. His agency said PCR "remains a very reliable test" and people should be confident in its results.Discrepancies among different testing methods are common in the lab industry.

Routine, inexpensive testing of New York City students, teachers and staffers would allow schools to quickly identify new cases. Schools would sometimes close based on test results that might be inaccurate. Campers were tested three times – a lab test before they arrived, a rapid test at the camp and another lab test days later. One camper tested positive after arriving, but medical staff concluded it was a false positive after the child was tested seven times. Nevertheless, the child was isolated in a medical unit until there were no signs of COVID-19.

Sherry Perry, a certified nursing assistant, works in a nursing home and has a second job as a home health aide. Some nurses use vacation time and sick days during quarantine, leaving less flexibility to take time off for other reasons.Nursing homes in New Hampshire and Texas have reported false positives. In Connecticut, errors at the state lab meant 90 people, including nursing home residents, registered false positives from mid-June through mid-July.

"You can always retest a positive result to get a confirmation," Parkinson said."It's accurate to say the antigen tests are not as precise as the PCR tests. But the speed of getting results probably outweighs the disadvantage of their slightly reduced accuracy."Some experts want the FDA to loosen oversight of rapid tests that can be taken at home and deliver immediate results, albeit without the sensitivity or accuracy of lab tests.

 

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