Revised Trauma Score Calculator (RTS & T-RTS)

Understanding the Revised Trauma Score (RTS)

The Revised Trauma Score (RTS) is a standardized physiological scoring tool developed by Dr. Howard R. Champion and colleagues in 1989. Widely utilized in pre-hospital emergency medical services (EMS), emergency departments, and trauma registries, the RTS provides an objective framework for triaging acutely injured patients, allocating critical trauma resources, and benchmarking mortality outcomes.

Unlike anatomical scoring systems such as the Injury Severity Score Calculator, the RTS evaluates acute physiological derangements across three fundamental vital parameters:

Glasgow Coma Scale (GCS): Evaluates neurologic responsiveness and central nervous system function.
Systolic Blood Pressure (SBP): Evaluates hemodynamic stability, perfusion, and hemorrhagic shock severity.
Respiratory Rate (RR): Evaluates ventilatory status, airway integrity, and respiratory compromise.

RTS Parameter Coding System

To compute either version of the score, raw clinical measurements are first categorized into coded values ranging from 0 (worst) to 4 (normal):

Coded Value	Glasgow Coma Scale (GCS)	Systolic Blood Pressure (SBP)	Respiratory Rate (RR)
4	13 to 15	> 89 mmHg	10 to 29 breaths/min
3	9 to 12	76 to 89 mmHg	> 29 breaths/min
2	6 to 8	50 to 75 mmHg	6 to 9 breaths/min
1	4 to 5	1 to 49 mmHg	1 to 5 breaths/min
0	3	0 mmHg (no pulse)	0 breaths/min (apnea)

Triage RTS vs. Physiological Weighted RTS

The RTS has two distinct applications in clinical practice:

1. Triage RTS (T-RTS)

Triage RTS is designed for rapid pre-hospital field triage. It is simply the sum of the three coded values:

$$\text{T-RTS} = \text{GCS}_c + \text{SBP}_c + \text{RR}_c$$

The score ranges from 0 to 12. According to field triage guidelines from the American College of Surgeons Committee on Trauma (ACS-COT), a T-RTS score of 11 or lower signifies severe trauma and mandates immediate transfer to a designated Level 1 or Level 2 trauma center.

2. Weighted Physiological RTS

Used predominantly in trauma registries, quality assessment, and epidemiological studies, the weighted formula accounts for the differing predictive impact of each vital parameter:

$$\text{RTS} = (0.9368 \times \text{GCS}_c) + (0.7326 \times \text{SBP}_c) + (0.2908 \times \text{RR}_c)$$

The weighted RTS ranges from 0.0000 to 7.8408. Higher scores correspond to higher survival likelihood.

Survival Probability Estimation

Based on Champion et al. (1989) data from the Major Trauma Outcome Study (MTOS), standalone physiological RTS correlates with survival probabilities as follows:

Weighted RTS Score	Estimated Survival Probability	Clinical Severity Interpretation
7.84	98.8%	Physiologically normal / Low mortality risk
7.00	96.9%	Mild physiological disruption
6.00	91.9%	Moderate injury
5.00	80.7%	Significant trauma compromise
4.00	60.5%	Severe trauma / High mortality risk
3.00	36.1%	Critical physiological deterioration
2.00	17.2%	Grave prognosis
1.00	7.1%	Extremely critical / Imminent demise
0.00	2.7%	Profound arrest / Non-responsive

Related Clinical Tools

For broader inpatient or critical care monitoring, consider using our companion calculators:

Modified Early Warning Score (MEWS) Calculator for inpatient deterioration detection.
qSOFA Score Calculator for quick sepsis risk assessment.
Revised Geneva Score Calculator for pulmonary embolism stratification.

Frequently Asked Questions

What is the primary difference between T-RTS and weighted RTS?

T-RTS (Triage Revised Trauma Score) is a quick integer sum ranging from 0 to 12 intended for rapid pre-hospital triage decisions. The weighted RTS uses statistical regression coefficients (0.9368 for GCS, 0.7326 for SBP, and 0.2908 for RR) yielding a score from 0 to 7.8408, intended for quality registries, TRISS mortality calculations, and outcome research.

What T-RTS cutoff indicates trauma center referral?

A Triage RTS of 11 or lower indicates significant physiological derangement and is recognized by the ACS-COT as a primary triage trigger for immediate transport to a designated trauma center.

Can RTS be calculated if the patient is intubated?

If a patient is intubated or chemically paralyzed prior to GCS and respiratory rate assessment, the raw RTS may underestimate neurological responsiveness. In such scenarios, clinicians document the best pre-intubation assessment or rely on dedicated trauma registry substitution rules.

How does RTS integrate with TRISS?

In TRISS (Trauma and Injury Severity Score) methodology, the weighted RTS represents the physiological component, combined with the anatomical Injury Severity Score (ISS) and patient age category to predict individualized survival probabilities.

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Revised Trauma Score Calculator