Once on the scene, we begin to assess the situation. (The cape tends to get in the way so we leave it in the truck - we only use that for media appearances anyway.) Like Superman, we often rely on our own personal attributes to determine and the problem. Primarily, while we don't have x-ray vision (but we have a gadget for that!) what we externally see can offer a lot of clues. Our ears become super-powered with the simplest of instruments, and our hands can be one of the greatest diagnostic tools we have (see our blog on rectal exams).
The big difference (other than the fact that we're human and Superman is an alien with superpowers) is that we can't always save the day. We do everything we can for the patient but sometimes it just isn't enough. Even superheroes lose once in a while.
But if superheroes can lose, then why can't we be Superman? I mean think about it, have you ever seen your vet and superman in the same room at the same time? Time to go - the Personal Emergency Communication Device is beeping!