There are different tests out there, many are pretty bad. Some are pretty good, for example Abbott's clears 90% in both specificity and sensitivity. That said,

There are different tests out there, many are pretty bad. Some are pretty good, for example Abbott's clears 90% in both specificity and sensitivity. That said, given a low prevalence of the disease, this is actually fairly likely to give false positives. 93.8% sensitivity suggests the false negative rate should be pretty low with that test. https://www.360dx.com/immunoassays/study-finds-abbott-coronavirus-serology-test-more-accurate-euroimmun-test#.Xt6qhy2z1MY https://www.360dx.com/immunoassays/study-finds-abbott-corona...