I don’t send these people without talking to them. If I hear them saying something like that or the nurse tells me I walk in and tell them that I recommend they not eat/drink if they should be npo, but if it’s that or no workup they can have it but might delay blah blah blah. If they aren’t reasonable or are demanding we use our staff to perform non clinical duties i point out the door. I don’t lose sleep over this. If the whole thing is documented, I have trouble believing they’ll find a sympathetic jury, but I’m in a pretty good malpractice environment.
I don’t document ama for legal purposes, though I think it doesn’t hurt anything there. I do it for communication with other docs regarding why a standard workup didn’t happen, I do it for the ombudsman, and I do it for the Monday morning qbs (the qa comittee and abrasive specialists). I find that it does seem to prevent these things from escalating.
edit: if they leave without my having a chance to talk to them I just write that down and don’t lose sleep over it. I make a reasonable attempt to contact them (phone call x2) to have ama conversation, document that, then go about my business. I always discuss my differential during my initial pass, and so I note the life threats/disabling conditions pt was aware of and that they left before we could rule these out and knew it.