ER: Emergency Room / Emergency Department Abbreviation
ER = Emergency Room or Emergency Department (ED) — hospital unit providing 24/7 unscheduled acute care for life-threatening, urgent, and emergent conditions.
Function
- Triage (ESI 1–5 acuity scale)
- Stabilization (ABCs: airway, breathing, circulation)
- Diagnosis, treatment, disposition (admit, transfer, discharge)
- Legal mandate: EMTALA (screening/stabilization regardless of payment)
Terminology
- ED preferred in professional/administrative use (department, not single room)
- ER common in public, media, historical
- A&E (UK/Commonwealth) = Accident & Emergency
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