"... In the U.S., more than 15 companies have notified the FDA that they have developed the tests, the agency said last week. Companies are permitted to begin distributing the tests to hospitals and doctors’ offices, provided they carry disclaimers that the tests haven't been reviewed by the agency.
The tests can help researchers understand how widely an infection has spread in a community.
However, they are not reliable for detecting coronavirus as it actively spreads, said Northwestern University’s Institute for Global Health director Robert L. Murphy.
“I would be very wary of anybody trying to sell an antibody tests,” Murphy said.
In an email, the FDA said it is not authorizing any blood tests for detection of coronavirus... "
abcnews.go.com/US/wireStory/...nute-test-coronavirus-69926105