quest indicates that they’re not using an FDA-validated test:
https://education.questdiagnostics.com/faq/FAQ219
For $119. they should go ahead and get the Roche test:
https://www.roche.com/media/releases/med-cor-2020-05-03.htm
https://www.cbsnews.com/news/coronavirus-antibody-test-roche-fda-approval/