Injury Severity Score

[1][2] It correlates with mortality, morbidity and hospitalization time after trauma.

A major trauma (or polytrauma) is defined as the Injury Severity Score being greater than 15.

[2] The AIS Committee of the Association for the Advancement of Automotive Medicine (AAAM) designed and improves upon the scale.

The Abbreviated Injury Scale (AIS) is an anatomically based consensus-derived global severity scoring system that classifies each injury in every body region according to its relative severity on a six-point ordinal scale: There are nine AIS chapters corresponding to nine body regions: The ISS is based (see below) upon the Abbreviated Injury Scale (AIS).

Since a score of 6 ("unsurvivable") indicates the futility of further medical care in preserving life, this may mean a cessation of further care in triage for a patient with a score of 6 in any category.