Trauma Score Calculator

Trauma Score Calculator for Critical Care. The total runs 1 (worst) to 16 (normal physiology), and the score moves in the opposite direction from most emergency scales: a low number is the alarm. A widely used field cutoff is a Trauma Score of 12 or below, which in the original prehospital work captured essentially all patients who went on to die while accepting some over-triage of stable patients, an intentional trade favoring sensitivity. Scores of 14-16 correspond to minimal physiologic disturbance and very low predicted mortality; scores of 12-13 are a caution band; totals at or below 12 drive a decision to bypass local hospitals for a designated trauma center and to escalate resuscitation. The score also serves as a case-mix adjuster, letting one system's outcomes be compared against another's after accounting for how sick the patients actually were on arrival.

How this calculator works

The Trauma Score is a physiologic severity index that codes five bedside variables and sums them into a single value from 1 to 16, where lower totals signal more severe physiologic derangement. It grades Glasgow Coma Scale (converted into a 1-5 band), respiratory rate, respiratory expansion (normal vs. shallow/retractive), systolic blood pressure, and capillary refill. Each variable is assigned an ordinal code (typically 0 up to 4-5), and the coded values are added with no weighting or regression coefficients. It was derived by Champion and colleagues in 1981 as a peer-reviewed refinement of the earlier Triage Index, deliberately built from measurements a paramedic can obtain at the roadside without instruments.

When to use this calculator

Use it as a prehospital and early-ED field triage instrument for acutely injured adults, to flag who needs a trauma center and to normalize injury severity when auditing prehospital care or comparing transport systems. It was designed for blunt and penetrating trauma in the field where anatomic scoring (ISS) is impossible because injuries are not yet defined. It should not be used to grade isolated head injury in fine detail (GCS alone or RTS does that better), and its capillary-refill and respiratory-expansion components are unreliable in the dark, in cold, or in hypothermic patients, which is precisely why the 1989 revision removed them. For most contemporary systems the Revised Trauma Score (RTS/T-RTS) has superseded it.

Inputs used

  • Respiratory rate
  • Systolic blood pressure
  • Glasgow Coma Scale or neurologic status

Clinical interpretation

The total runs 1 (worst) to 16 (normal physiology), and the score moves in the opposite direction from most emergency scales: a low number is the alarm. A widely used field cutoff is a Trauma Score of 12 or below, which in the original prehospital work captured essentially all patients who went on to die while accepting some over-triage of stable patients, an intentional trade favoring sensitivity. Scores of 14-16 correspond to minimal physiologic disturbance and very low predicted mortality; scores of 12-13 are a caution band; totals at or below 12 drive a decision to bypass local hospitals for a designated trauma center and to escalate resuscitation. The score also serves as a case-mix adjuster, letting one system's outcomes be compared against another's after accounting for how sick the patients actually were on arrival.

Worked example

A 34-year-old struck by a car arrives with GCS 10, respiratory rate 32/min, shallow (retractive) chest expansion, systolic BP 88 mmHg, and delayed capillary refill. Coding roughly: GCS 10 falls in the middle band, RR 32 is above the normal window and scores below the peak, shallow expansion scores 0, SBP in the 70-90 range scores mid-range, and delayed capillary refill scores 0. Summing these coded values yields a total in the low-to-mid single digits, well under 12. A Trauma Score of 12 or less identifies a high-risk patient (in early series roughly 20% of such patients died versus near-zero mortality above 12), so this patient meets criteria for immediate trauma-center transport and aggressive resuscitation.

Limitations and safety notes

Two of its five inputs, capillary refill and respiratory expansion, proved hard to assess reliably in field conditions (poor lighting, cold, hypothermia), and this drove the 1989 revision that dropped both. As a purely physiologic score it can miss anatomically devastating but initially compensated injuries, a young patient can maintain blood pressure and a near-normal score despite major hemorrhage, so a reassuringly high number does not exclude serious injury. It performs less well for isolated severe head injury than GCS-weighted successors, and it is not validated as a pediatric tool. Because it predates modern prehospital airway and hemodynamic management, its mortality bands should be read as historical calibration rather than current absolute risk.

Frequently asked questions

What is the difference between the Trauma Score and the Revised Trauma Score?

The original 1981 Trauma Score used five variables: GCS, respiratory rate, respiratory expansion, systolic blood pressure, and capillary refill. The 1989 Revised Trauma Score kept only GCS, systolic BP, and respiratory rate, dropping the two components that were unreliable to assess in the field. The triage version (T-RTS) simply sums the three coded values, while the RTS applies regression-derived weights for outcome prediction.

Is a high or a low Trauma Score worse?

A low score is worse. The scale runs from 1 to 16, with 16 representing normal physiology and 1 representing near-death derangement. This is the reverse of many ED scores, so it is a common source of error when reading it quickly.

What cutoff should trigger trauma-center transport?

A Trauma Score of 12 or below is the classic threshold for high-risk triage. In the original prehospital validation this captured essentially all patients who subsequently died, at the cost of over-triaging some patients who turned out to be stable, a deliberate bias toward sensitivity in a field triage tool.

Can a severely injured patient still have a high Trauma Score?

Yes. Because it measures physiology rather than anatomy, a young patient can compensate for significant hemorrhage or an occult injury and register a near-normal score initially. A reassuring score should never override mechanism of injury or clinical suspicion, and serial reassessment matters more than a single value.

Is the Trauma Score still used today?

It has largely been replaced by the Revised Trauma Score for field triage and by the RTS component within TRISS methodology for outcome benchmarking and trauma registry work. The original score remains historically important and conceptually useful, but most modern EMS protocols reference the three-variable revised version.

References

  • Champion HR, Sacco WJ, Carnazzo AJ, Copes W, Fouty WJ. Trauma score. Crit Care Med. 1981. PMID: 7273818.
  • Champion HR, Sacco WJ, Copes WS, Gann DS, Gennarelli TA, Flanagan ME. A revision of the Trauma Score. J Trauma. 1989. PMID: 2657085.
  • Moreau M, Gainer PS, Champion H, Sacco WJ. Application of the trauma score in the prehospital setting. Ann Emerg Med. 1985. PMID: 3931510.

Editorial review and citation methodology

Reviewed by the Quick Medical Calculator Editorial Team. Last reviewed: May 14, 2026. The review checks calculator inputs, intended population, interpretation, limitations, and source alignment.

  • Prefer original validation studies for scoring systems and prediction tools.
  • Use current specialty society guidance, transplant allocation policy, public health guidance, or regulator resources when they govern clinical use.
  • Include limitations and safety notes when a calculator is population-specific, context-dependent, or unsuitable as a standalone decision tool.

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