Emergency Medicine
Revised Trauma Score (RTS) & TRISS Predicted Survival Probability
Calculates physiological RTS (0–12) and TRISS predicted survival probability in severe trauma.
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Parameters
Revised Trauma Score (RTS) & TRISS Predicted Survival Probability Result
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Formula
Triage RTS = GCS Code (0–4) + SBP Code (0–4) + RR Code (0–4) (Range: 0–12)
Physiological RTS = 0.9368(GCS) + 0.7326(SBP) + 0.2908(RR) (Range: 0–7.84)
TRISS Survival Ps = 1 / (1 + e^-b), where b = β₀ + β₁(RTS) + β₂(ISS) + β₃(Age)Clinical Pearls
The benchmark physiological score utilized globally by EMS and trauma teams to trigger emergency trauma room activations and benchmark trauma center outcomes.
Limitations
RTS can be artificially depressed by severe acute alcohol intoxication or recreational drug overdose without intracranial pathology.