question: What is Abbreviated Injury Scale (AIS) used to determine?
answer: The Abbreviated Injury Scale (AIS) is an objective anatomically-based injury severity scoring system that classifies each injury by body region on a 6 point scale. AIS is the system used to determine the Injury Severity Score (ISS) of the multiply injured trauma patient.
  
  AIS CLASSIFICATIONS
  The AIS classifies individual injuries by body region as follows:
  AIS 1 – Minor
  AIS 2 – Moderate
  AIS 3 – Serious
  AIS 4 – Severe
  AIS 5 – Critical
  AIS 6 – Maximal (currently untreatable)