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Home > Articles > Abbreviated Injury Scale (AIS) Score


The Abbreviated Injury Scale (AIS) is an anatomical scoring system first introduced in 1969. Since this time it has been revised and updated against survival so that it now provides a reasonably accurrate was of ranking the severity of injury. The latest incarnation of the AIS score is the 1990 revision. The AIS is monitored by a scaling committee of the Association for the Advancement of Automotive Medicine.

Injuries are ranked on a scale of 1 to 6, with 1 being minor, 5 severe and 6 an unsurvivable injury. This represents the 'threat to life' associated with an injury and is not meant to represent a comprehensive measure of severity. The AIS is not an injury scale, in that the difference between AIS1 and AIS2 is not the same as that between AIS4 and AIS5. Organ Injury Scales of the American Association for the Surgery of Trauma are mapped to the AIS score for calculation of the Injury Severity Score.

AIS Score Injury
1 Minor
2 Moderate
3 Serious
4 Severe
5 Critical
6 Unsurvivable


Copes WS, Sacco WJ, Champion HR, Bain LW, "Progress in Characterising Anatomic Injury", In Proceedings of the 33rd Annual Meeting of the Association for the Advancement of Automotive Medicine, Baltimore, MA, USA 205-218

Association for the Advancement of Automotive Medicine


drkentino, January 24, 2009

what is the precise definition of polytrauma?

obxquer, Bucharest, November 21, 2009

multiple injuries = polytrauma ...

fborup, August 14, 2013

Does anyone know if there is a digital version? And if so - where can I find a digital version of the AIS manual?

Simon Glasgow, December 09, 2013

The AIS dictionary is available from the authors at https://sl-507-3.slc.westdc.net/~ireneher/Publications.php.

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