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Abbreviated Injury Scale

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Abbreviated Injury Scale (AIS) is an internationally accepted way to classify the severity of injuries. Developed by the Association for the Advancement of Automotive Medicine (AAAM), AIS is the globally accepted tool for ranking injury severity.


Injuries vary in the severity from minor injuries that can be treated or heal on their own to very severe (maximal) injuries that cannot be cured. In order to standardize the description and to compare, an internationally accepted injury severity scale was developed by the Association for the Advancement of Automotive Medicine.


The current version is the 2015 version. According to the AAAM, AIS 2015 is the next step in the continual evolution of traumatic injury classification and scaling.  This newest revision improves brain injury coding, spinal cord impairment coding and enhances many code definitions by incorporating current and appropriate medical terminology.

Abbreviated injury Score
AIS-Code Injury Example AIS % prob. of death
1 Minor superficial laceration 0
2 Moderate fractured sternum 1 – 2
3 Serious open fracture of humerus 8 – 10
4 Severe perforated trachea 5 – 50
5 Critical ruptured liver with tissue loss 5 – 50
6 Maximum total severance of aorta 100
9 Not further specified (NFS)

Classification document

The AAAM has a classification document available via their website here

See also


External links

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