Which best describes ESI-3?

• A. ESI-3 is for proven life-threatening injuries.
• B. ESI-3 decisions require immediate physician; seen within 5 minutes.
• C. ESI-3 is for stable ABC but possible life threat; seen within 1 hour; medium/high resource intensity.
• D. ESI-3 never uses diagnostic studies.

Answer: (C)

ESI-3 describes a patient who is not in immediate danger but could deteriorate and will typically need more than one resource to evaluate or treat. The airway, breathing, and circulation are currently stable, yet there is a possibility of a life-threatening issue that requires prompt but not immediate physician assessment. The expected wait time is about an hour, and the care often involves moderate to high resource use (labs, imaging, IV fluids, meds, etc.). This differentiates it from life-threatening cases that require immediate action (ESI level 1), and from lower-acuity levels that need fewer resources or no resources at all (ESI levels 4 or 5). It also conflicts with the idea that no diagnostic studies are used at this level, since evaluating a potential life threat and planning treatment typically involves tests or imaging.