"Its all about semantics and turf protection. The docs dont want you stealing their thunder, but EMS is no different.
I do not know why so many are so afraid to admit that we must make a diagnosis of some sort if we are to do any more than be taxi drivers.
I hope you have a diagnosis in mind before you start shoving tubes, needles, and medicines into patients, but with that being said, we can not make a true diagnosis on many patients due to our inability to do labs and xrays."
Assessment is different from diagnosis in two distinct, important ways: the content and the process. In terms of the content, assessment is treating the symptoms, whereas diagnosis is figuring out the true extent and mechanisms of the presenting pathology. In terms of the process, assessment is performed and thought about differently than the way in which a doctor would perform a differential diagnosis.
A doctor's thought process might assume, for instance, that the patient's respiratory distress has already been treated with what they consider 'basic' procedures- oxygen, IV, etc. Notice that to them almost all procedures will seem basic since by necessity a doctor approaches medicine from a more broader vantage point. The doctor thinks foremost about the root cause of the respiratory distress and the accompanying definitive treatments.
It is absolutely essential to do a good pre-hospital assessment and provide the appropriate treatments, but we should remember that, no matter what, we are not doctors without going to medical school. If at some point in the future higher-ups decided to allow field decisions to be made regarding denial of transport and/or field treatment alone, that would require a true-blue differential diagnosis. That would require a doctor, not a pre-hospital allied health provider, and thus would spell the end of all of us. So we should be careful what we wish for.