The Injury Severity Score (ISS) is an anatomical
scoring system that provides an overall score for patients with multiple
injuries. Each injury is assigned an Abbreviated
Injury Scale (AIS) score and is allocated to one of six body regions
(Head, Face, Chest, Abdomen, Extremities (including Pelvis), External).
Only the highest AIS score in each body region is used. The 3 most
severely injured body regions have their score squared and added together
to produce the ISS score.
An example of the ISS calculation is shown below:
|| No Injury
|| Flail Chest
|| Minor Contusion
Complex Rupture Spleen
|| No Injury
Injury Severity Score:
The ISS score takes values from 0 to 75. If
an injury is assigned an AIS of 6 (unsurvivable injury), the ISS score
is automatically assigned to 75. The ISS score is virtually the only
anatomical scoring system in use and correlates slinearly with mortality,
morbidity, hospital stay and other measures of severity.
It's weaknesses are that any error in AIS scoring increases the
ISS error, many different injury patterns can yield the same ISS
score and injuries to different body regions are not weighted. Also,
as a full description of patient injuries is not known prior to
full investigation & operation, the ISS (along with other anatomical
scoring systems) is not useful as a triage tool.
The ISS Calculator
will sit as a standalone window on your desktop.
Baker SP et
al, "The Injury Severity Score: a method for describing patients
with multiple injuries and evaluating emergency care", J Trauma