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Mnemonics, Simplified Concepts & Thoughts

Trauma Scoring Systems

Epomedicine, Mar 26, 2025Mar 26, 2025

Last updated on March 26, 2025

trauma scoring
Bairagi, A. (2016). Injury Severity Score (ISS) versus New Injury Severity Score (NISS) at a level one trauma unit in South Africa. Are we miss (Maximal Injury Severity Score) ing the point.
Scoring systemsScore typeBrief descriptionScore interpretation
Revised trauma score (RTS)PhysiologicRR + SBP + GCSEach parameter is scored 0-4 (Total range = 0-12)

Lower score indicates more severe injury (RTS 12 = <1% mortality; RTS 0 = >99% mortality)

Score <11 – transfer to trauma center
Injury severity score (ISS)AnatomicBody divided into 6 regions (head, face, chest, abdomen, extremities including pelvis & external) & each injury is assigned the AIS (1-6)Sum of the square of 3 highest scoring regions

Highest score is 75 (5² + 5² + 5²)

AIS of 6 is regarded as unsurvivable (automatically gets score of 75)
New injury severity score (NISS)AnatomicEach injury assigned a severity from 1 to 6, allowing multiple injuries in a body region to be consideredSum of the square of 3 highest AIS irrespective of body regions
Trauma & Injury severity score (TRISS)CombinedAttempts to predict mortality by combining anatomic and physiological derangementsCalculates a probability of survival based on logistic regression of RTS, ISS & age
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PGMEE, MRCS, USMLE, MBBS, MD/MS General conceptsOrthopedics

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Epomedicine. Trauma Scoring Systems [Internet]. Epomedicine; 2025 Mar 26 [cited 2025 May 9]. Available from: https://epomedicine.com/medical-students/trauma-scoring-systems/.

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