Table 1

 Emergency Severity Index

ABC, airway, breathing, circulation; ESI, Emergency Severity Index.
Vital functions (ABC) and level of consciousnessUnstable or unresponsiveThreatened or severe pain/distressStableStableStable
Life threat or organ threatObviousReasonably likelyUnlikely (possible)NoNo
Requires resuscitationImmediatelySometimesSeldomNoNo
Expected resource use—x rays, labs, consultations, proceduresMaximum (⩾2)High (⩾2)Medium (⩾2)Low (1)Low (none)
Response timeImmediate team effortMinutesUp to 1 hCan be delayedCan be delayed