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Everything in this lesson sits on top of three layers. Get them in order first, because the exam builds most of its wrong answers by blurring them together.
Scope of practice is what your level is legally authorized to do. It's set by the state, informed by the National EMS Scope of Practice Model. It's a legal boundary, not a suggestion.
Protocols and standing orders are the medical director's written, advance authorization for you to act without calling anyone. So they're off-line medical direction — also called indirect, because there's no one on the line with you when you act. Compare that to on-line medical direction, which is a real physician, in real time, on this specific patient. That's direct.
Credentialing is one layer narrower still. It's the medical director's determination that you specifically, at this agency, may perform a given skill. Not paramedics generally. You.
So the order runs scope, then protocols, then credentialing, and each one is narrower than the one before it. A skill can sit inside paramedic scope, and still be absent from your agency's protocols, and still not be credentialed to you personally. All three have to align before you act. "It's in my scope of practice" answers only the first question. It doesn't answer the other two.
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