FDA authorizes tests to measure antibody levels


FILE – In this Tuesday, April 14, 2020 file photo, a woman holds her hand out to have blood collected for a 15-minute test for COVID-19 coronavirus antibodies at a drive thru site in Hempstead, N.Y. Antibodies are the markers of infections that someone already had. (AP Photo/Seth Wenig)

(CNN) – The Food and Drug Administration is authorizing two new forms of coronavirus tests.

Like some previous tests, they look for antibodies that indicate a person has been infected at some point. But, they go a step further and try to measure the quantity of those antibodies.

Researchers want to use that data to study potential immunity in people who’ve had COVID-19. But, they say patients with coronavirus antibodies should not assume they can’t get COVID-19 again.

Antibody tests also aren’t the same as tests that determine whether a person is currently infected.

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