Where I work, they always make a big deal out of a pt being an MD. The nurse/whoever is always sure to specify it's _DR_ Smith, not Mr. Smith. I just had a patient the other day that I addressed as Miss Smith correct me and say "It's _Doctor_ Smith." Oh, what kind of physician are you? It was something weird, like biology!!! Whatever... Just minutes ago, my pt called for me- "Hey Nurse!!" They don't know.