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ISS - RTS - TRISS (Injury Severity Score - Revised Trauma Score - Trauma Injury Severity Score)

Variables	Severity level (help)	Points
Head and neck
Face
Chest
Abdomen, pelvic contents
Extremity, pelvic girdle
External
ISS = .
Respiratory rate (per min)
Systolic blood pressure (mmHg)
Glasgow coma scale (help)
RTS = .
Age (Pediatric cases (Ages < 15) use the blunt model for both blunt and penetrating mechanisms of injury.)
Predicted death rate (blunt) TRISS =		Predicted death rate (penetrating) TRISS =
ISS = Sum ((three most weighted region injury)²). ISS equals 75 for any patient with an AIS 6 injury.	TRISS (blunt): Logit =-0.4499 + RTS0.8085 + ISS-0.0835 + (age.points)*-1.7430 Predicted death rate = 1/(1 + e^Logit)	TRISS (penetrating): Logit =-2.5355 + RTS0.9934 + ISS-0.0651 + (age.points)*-1.1360 Predicted death rate = 1/(1 + e^Logit)
RTS = Sum ((resp.rate.points)0.2908; (sbp.points)0.7326; (Glasgow.points)*0.9368)

References

Baker SP et al. The injury severity score: a method for describing patients with multiple injuries and evaluating emergency care. J Trauma 1974;14:187-96.
Champion HR et al. A Revision of the Trauma Score. J Trauma 1989;29:623-9.
Boyd CR et al. Evaluating Trauma Care : The TRISS Method. J Trauma 1987;27:370-8.
Champion HR et al. Coefficients update. J Trauma 1995 Editorial Comment. 38:94-5.