Some manufacturers are inappropriately marketing their COVID-19 antibody/serology tests for diagnostic use, US Food and Drug Administration officials said at a 4 May press briefing. The realization has prompted the agency to revise its immediately-in-effect guidance of 16 March for both diagnostic and antibody tests.
While high-quality antibody tests can provide information about a population’s exposure to COVID-19, “the antibody tests may not be used...






