Without overanalyzing I would have to say that it is a BLS call unless the PT presents with at least one of the following:
1. Pain 7/10 or above.
2. No or weak extremity pulse or sensation.
3. No capillary refill being present or refill being >2-3 sec.
4. Severe bleeding secondary to a complex fracture (or edema if justified).
5. PT is presenting that they are having those rare but sometimes founded cardiac complications due to the fracture, i.e. clotting that is causing some kind of a blockage in which ALS intervention will be critical.
6. I am sure that I can think of others but these are the basics that would justify getting ALS on-scene. Pain alone can be called in to the hospital along with a preliminary report (they can have MS or Dilaudid on standby) if not too debilitating (0-6/10) but severe pain or complications would definitely justify the intercept.
While I appreciate some points in your response, I would like to add a few of my thoughts for different perspective purposes and to stimulate discussion.
1. So the patient has to be a 7 before you consider calling for ALS? Pain is subjective and everyone handles it differently. A guy could calmly tell you he is an 8 with minor grimacing upon movement and this would prompt you to call for ALS versus the person who is squirming and crying but states the pain is only a 5??? Would you tell them they need to hurt "some more" so you can call for ALS and pain relief?
See the lack of logic in setting a number that would prompt you to call for help? Pain is pain and if we can treat it prehospitally, then we should.
2. Would this make you wait on ALS or would it prompt you to hurry up and BLS it all the way to get to more definitive care? In a few systems, they would benefit from ALS care, but this is a get to a hospital now situation, so technically it is BLS.
3. See #2
4. Bleeding control is a BLS skill, even severe bleeding. Now if they are getting hypotensive, tachycardic, pale, etc...all the signs and symptoms of shock (all from a fx arm mind you) then maybe call for ALS intercept if none of the BLS remedies are working, but still is a BLS call for the most part.
5. Well this is no longer a fx arm call is it? It is now chest pain or shortness of breath...so its a moot point in this discussion.
6. Doesn't every hospital have pain meds "on standby"?
I doubt they would have it out of the locked cabinet and locked and loaded ready to inject without first conducting an assessment and checking them in.
So in short, ANY pain from an isolated fracture justifies ALS intervention.