Emergency Severity Index (ESI) Implementation Handbook, 2012 Edition Figure 2-1a. ESI Triage Algorithm Figure 2-1a. ESI Triage AlgorithmReturn to Document Current as of November 2011 Internet Citation: Emergency Severity Index (ESI) Implementation Handbook, 2012 Edition: Figure 2-1a. ESI Triage Algorithm. November 2011. Agency for Healthcare Research and Quality, Rockville, MD. http://www.ahrq.gov/professionals/systems/hospital/esi/esifig21a.html