Why is it that...

...when you go to the hospital for a scheduled procedure, they seem anxious to get you out the door as soon as possible ("But I'm still half asleep, and the bleeding hasn't stopped!" "You'll be fine. Just remember to change the bandages every 30 minutes."), but when you get checked in to the hospital as a result of an emergency room visit, they don't seem eager for you to go at all ("It's nothing serious. Probably just a bad case of indigestion. But just be sure, we'll run a few tests and keep you here for observation for the next couple of weeks. I'll drop by every three days to see how your doing.")?