Injury Severity Score Calculator
Calculate ISS trauma score from AIS body region severity grades with mortality risk interpretation.
What Is the Injury Severity Score?
The Injury Severity Score (ISS) quantifies trauma severity in patients with multiple injuries. It is based on Abbreviated Injury Scale (AIS) grades across six body regions and correlates with mortality, morbidity, and hospital length of stay. ISS above 15 is often considered major trauma. Compare with the Glasgow Coma Scale Calculator.
How ISS Is Calculated
Each body region receives the worst AIS score from 0 (none) to 6 (unsurvivable). If any region scores 6, ISS is automatically 75. Otherwise, the three highest regional scores are squared and summed. Maximum ISS is 75.
Severity Classification
ISS below 9 indicates minor trauma, 9 to 15 moderate, 16 to 24 severe, and 25 or higher very severe or profound injury. ISS supports triage, research, and quality reporting but must always be interpreted with clinical findings and vital signs.
Frequently Asked Questions
What body regions are included in ISS?
Head and neck, face, chest, abdomen (including lumbar spine), extremities including pelvic girdle, and external injuries such as burns or skin trauma.
Why are AIS scores squared in ISS?
Squaring emphasizes the most severe injuries so combined trauma reflects disproportionate risk when multiple serious injuries coexist.
What ISS defines major trauma?
ISS greater than 15 is widely used as a threshold for major trauma, though local protocols may vary.
What happens when any AIS score is 6?
A score of 6 in any region means unsurvivable injury under AIS rules, and ISS is set to 75 regardless of other regions.
Is ISS the same as RTS or TRISS?
No. ISS is anatomical. Revised Trauma Score uses physiology, and TRISS combines both with age and mechanism for survival probability estimates.
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