Think Wolverine from X-Men, only my character isn't a mutant or anything.

Say a man gets into a really bad car accident, and while he's laying there dying, something happens to him, something that starts to heal him on the spot. When he gets to the hospital, he's almost completely healed up, looking and feeling like he'd never been an accident at all.

What do you think a doctor's reaction would be to that? Obviously, they're going to be incredulous and stunned, speechless even, but I'm just looking for a few more opinions.

What do you think a doctor would say to him?

"You must not have been hurt as bad as the paramedics thought."

(Denial, in other words.)

I remember reading somewhere that bloodstains get a lot larger than, let's day a puddle of water of equal volume would, because blood spreads out in a monomolecular manner (like oil on a water surface, more or less). So it can look as if a person has lost a lot of blood when it acutally isn't so bad at all. I could imagine the doc bringing up an explanation like that.

He might also blame the allegedly dumb first-aider for passing on wrong information etc.

Of course both those things also fall into the "denial" category.

Another interesting approach would be to let the doc perceive it as a kind of universal justice thing. Maybe someone who did not appear to be fatally injured died on him unexpectedly the other day.

I think he'd say HEY GUYS COME QUICK YOU WON'T BELIEVE WHAT JUST HAPPENED

I vote denial too.
The doctor in the hospital would be all " that's paramedics for you! the're at the end of their shift, tired to death, working too much, there's a new guy who doesn't know a fatal wound if it bites his bum" etc. Then they'll give your character a bag of saline solution and send him home as soon as they can.

Because no respectable doctor will say "this guy is healing too fast for a human being".

I think it would depend a bit on who brought him in. My dad does EMS work, and they do really develop relationships with the doctors and nurses at the hospital. If someone the doctor in question trusts and respects brought him in - or if the nurses saw the man when he was still badly injured, and told the doctor so - there might be more confusion. After that, there's a whole range of things he might do. Denial is believable, although less so if the doctor believes the people she works with. In a realistic situation, I think most doctors would request that your man stay the night so they could watch him. If you want him to leave quickly, though, there are a lot of ways you could pull that off - say she's new at this position, doesn't want to rock the boat, is really busy, doesn't trust the EMS workers yet, figures that they screwed up and now the man should go. It's believable either way.

I think confusion or denial are plausible responses, possibly assuming it's some sort of clerical error at first - like the wrong patient in that bed, the charts have been mixed up, something like that. Then I suppose an immense amount of intrigue later on, especially if the patient was reported to have some sort of distinctive injury (like an open fracture or something) and when examined later on has the scars such an injury would produce.

I know I'd be quite confused if I was that doctor :p

Joss Whedon did some similar things on Buffy and Angel - both lead characters healed abnormally fast from their (frequent) injuries. In most of the scenarios I remember on those shows, the injured character would turn it around and try to put people at ease. Basically, whenever anyone who didn't know the reason they healed so quickly noticed, they'd deflect with a quick "Oh, it was just a scratch. Not nearly as bad as it looked," and change the subject quickly.

In a more realistic scenario, the doctor would be shocked, but it wouldn't be taken at face value that your character was totally healed. If he starts saying that he feels fine, most doctors would probably assume that he's going into shock. If noticeable injuries are healing fast enough that they appear minor, doctors would still want to check for internal injuries so your character would still have to go through a lot of tests and so forth. The combination of possible shock and internal injuries would mean that people would be working on the patient for a while before coming to the conclusion that nothing really was wrong.

I have to imagine also that if your character came in covered in blood but with virtually no visible wounds, people would start freaking out under the assumption that someone else had been in the car.

I think it has a great deal to do with the doctor. Some doctors are comfortable saying "somthing unexplainable happened" other it would take someone rising from the grave to do it. I think that the type of woulds matter greatly. if the injury would have been mostly internal - broken ribs, punctered lungs, or any broken bones that the bone is not poping out, would be considered a mistake. if it was really visable like bullet exsit wounds, then I think denial won't work. the doctor might even take credit for it.

if you have excess sugar in your blood, it would could cause slow healing of would.