I have several friends who had interviews last year
None of them was subjected to a medical test, written or verbal!
If at all, they may ask about what's in the CV. Like for example if you have done some research in asthma then ask you about asthma or in extreme situation they'll ask about how to respiratory function tests for example.
Programs rely on the USMLE and they don't expect themselves to be a better judges of our knowledge than the USMLE!