Not everyone in EMS does the same job. The system is built on a tiered structure of training and certification, each level authorized to perform a defined set of skills — called a scope of practice. Understanding where you fit in that structure, and what the levels above and below you can and cannot do, is essential for working effectively as a team. The National EMS Scope of Practice Model, published by NHTSA, defines four certification levels. The first is the Emergency Medical Responder (EMR). EMRs receive approximately 40-60 hours of training and are authorized to perform basic life-saving interventions — CPR, bleeding control, opening an airway, and assisting with certain medications. They are often first on scene: police officers, firefighters, ski patrol, or industrial safety personnel. They can begin care but cannot transport patients independently. The second level is the Emergency Medical Technician, or EMT. This is you. EMT training is typically 120-150 hours and represents the minimum staffing level for a transporting ambulance in most states. EMTs provide Basic Life Support — BLS. That includes patient assessment, airway management (though not advanced airways like intubation), oxygen therapy, bleeding control, spinal motion restriction, fracture splinting, assisted medications (nitroglycerin, epinephrine auto-injector, bronchodilators), and CPR with AED use. BLS is the backbone of EMS. The vast majority of EMS calls are handled at the BLS level. The third level is the Advanced EMT, or AEMT. AEMTs have additional training — typically 200+ additional hours — and can perform a limited set of advanced skills: IV access, IO access, and a small number of medications beyond the EMT scope. AEMTs occupy the middle ground between EMT and paramedic. The fourth and highest level is the Paramedic. Paramedic training is typically 1,200-1,800 hours or more and often includes clinical rotations in emergency departments, ICUs, and operating rooms. Paramedics provide Advanced Life Support — ALS. Their scope includes advanced airway management (endotracheal intubation, surgical airways), intravenous and intraosseous access, cardiac monitoring, manual defibrillation, synchronized cardioversion, transcutaneous pacing, and a broad pharmacological toolkit. Paramedics operate under direct and indirect medical oversight and can perform interventions that would require a physician in the hospital setting. Understanding these distinctions matters practically. When you respond to a call and ALS is en route, you may need to make decisions about whether to wait for ALS or initiate transport. When you hand off a patient to the emergency department, you need to communicate clearly what was done at the BLS level. And throughout your career, you'll work alongside providers at different levels — mutual respect and clear communication across the team saves lives. Scope of practice is also defined at the state level. Your state EMS office may expand or restrict the national model. Some states allow EMTs to administer additional medications; others are more restrictive. Always know your state's current scope — it is the legal framework within which you practice.