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Printed on 4/21/2026
For informational purposes only. This is not medical advice.
Emergency Severity Index (ESI) is a five-level triage algorithm used in emergency departments to prioritize patient urgency and resource planning. It first identifies immediate life-saving needs, then high-risk presentations, and finally expected resource utilization with vital-sign modifiers.
Formula: Rule-based triage algorithm producing Levels 1-5 (not a numeric additive score).
Lower ESI numbers indicate higher acuity and more urgent ED prioritization needs.
Use at ED triage for initial acuity assignment and ongoing reprioritization as clinical status changes.
ESI depends on accurate triage judgment and local workflow consistency; frequent reassessment is essential in unstable conditions.
For related assessments, see qSOFA Score, Shock Index and MAP Calculator.
Disclaimer: This tool is for educational and informational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider with questions about your health.
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