Which term describes the emergency department physician providing on-line control?

• A. Base Physician
• B. On-Line Medical Control
• C. System Design
• D. Field Triage

Answer: (A)

In EMS, real-time orders to field crews come from online medical control. The physician who provides that direct, in-the-moment guidance is the base physician (base hospital physician) who gives online instructions to treatment and transport decisions. This term specifically refers to the person delivering online control, not the process itself.

Online medical control describes the live guidance or orders, which is why the term describing the physician is base physician. The other options don’t fit because system design is about how services are organized, field triage is about prioritizing patients at the scene, and online medical control refers to the real-time direction itself rather than the individual providing it.