The doctor will view the x-rays. He/she might have a radiologist look at them again, and they might re-take the x-rays.
Trouble is, sometimes the swelling is too great at first and they have to wait a few days to a week before putting a cast on, if that's what is indicated for this type of injury.
At the very least, I would make sure they immobilize it in a sling or another type of brace until it can be casted.
In rare cases, surgery might be indicated as well, but I wouldn't worry about that too much.
Hope that helps!
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Thanks!
Kerry