ToolsCalculators
Trauma Score and Injury Severity Score (TRISS)
Combines physiologic (Revised Trauma Score) and anatomic (ISS) injury severity with age and mechanism to predict survival.
Trauma Score and Injury Severity Score (TRISS)
Mechanism
Age
years
Glasgow Coma Scale
points
Systolic blood pressure
mmHg
Respiratory rate
/min
Injury Severity Score (ISS)
points
Complete the fields above to see the result.
When to use
- Benchmarking observed versus expected trauma survival for quality assurance and trauma registry outcome comparisons.
Formula
RTS = 0.9368xGCS-coded + 0.7326xSBP-coded + 0.2908xRR-coded (each coded 0-4 by standard bands). b = b0 + b1xRTS - b2xISS - b3xAgeIndex (AgeIndex 0 if age<=54, else 1), using blunt coefficients (b0=-0.4499, b1=0.8085, b2=0.0835, b3=1.7430) or penetrating coefficients (b0=-2.5355, b1=0.9934, b2=0.0651, b3=1.1360). Probability of survival Ps = 1/(1+e^-b).
Pearls and pitfalls
- A trauma registry tool for comparing observed to predicted mortality (e.g. via the W-statistic), not a bedside triage tool.
- Coefficients derived from the Major Trauma Outcome Study (MTOS) database and may not generalise to all populations.