Not a Trauma Hospital, Go to CMC Main for REAL emergencies.
I had to go to Presby for some testing. Nice people, nice volunteers, nice front entrance staff to help you find your way. Better than trying to find your way by yourself.
Like I said, if you have a true medical emergency and you have a preference, go to CMC Main. BUT if you have to come for testing, Presby is pretty good. Like a Yelp 3 Star rating--A-OK.