I don’t know. We knew our friend had COVID so my mom asked doc about it virtually. They tested her. From there as we all got sick we knew what it was. I got tested myself but from then on the rest just assumed and took it as it came. We got better.
(My MIL, unfortunately, did not, and died.)
Of course with Regeneron I understand in order to qualify for getting it free you must have associated comorbidities, have it done within 10 days of symptoms, and not be on oxygen.