MGAP Trauma Score: Clinical Guide

Overview

Calculates the Mechanism, Glasgow Coma Scale, Age and arterial Pressure trauma score. The calculator is intended to make the underlying equation transparent while preserving the requirement for clinical assessment and source-data verification.

Clinical Significance

Higher scores indicate lower mortality risk. The score was designed for early trauma triage and must not delay resuscitation or replace anatomical assessment.

When to Use

• Support prehospital or early emergency trauma risk stratification.
• Use the first reliable physiologic observations.
• Combine with mechanism-specific and system-specific triage criteria.

How It Is Calculated

• MGAP = GCS + 4 for blunt mechanism + 5 if age under 60 + SBP points: 5 for ≥120, 3 for 60–119 and 0 for <60 mmHg.
• MedicalC validates required values, applies the stated equation and rounds only the displayed result.
• Review intermediate measurements and assumptions whenever the result appears discordant with the clinical picture.

Interpretation

• Higher scores indicate lower mortality risk. The score was designed for early trauma triage and must not delay resuscitation or replace anatomical assessment.
• Interpret trends only when the same technique, units and clinical conditions are reasonably comparable.

Worked Example

Enter the required measurements in the displayed units. MedicalC applies: MGAP = GCS + 4 for blunt mechanism + 5 if age under 60 + SBP points: 5 for ≥120, 3 for 60–119 and 0 for <60 mmHg. Confirm the result against the original observations before using it in a clinical decision.

Patient Considerations

• Consider age, body size, pregnancy, organ support, medication, rhythm, ventilation, measurement conditions and acute physiological change where relevant.
• Use the earliest reliable values for prognostic trauma scores unless the score definition specifies otherwise.
• Repeat calculations only when a changed result could influence care and the source data remain valid.

Limitations

• GCS may be confounded by sedation, intoxication or hypoxia.
• The binary mechanism classification is simplified.
• External performance varies by setting.

Clinical Pearls

• Treat the calculator as a transparent equation, not an autonomous recommendation.
• Record the exact time and method of important measurements.
• Resolve a clinically implausible result by checking inputs before assuming unusual physiology.

Common Mistakes

• Entering values in the wrong unit.
• Combining measurements obtained at different clinical time points.
• Applying a published threshold outside its validated population or setting.
• Allowing a score to delay urgent treatment.

Evidence Base

The calculator implements the stated published or established relationship. Principal source: Sartorius D, et al. MGAP: a new simple prehospital triage score to predict mortality in trauma patients. Crit Care Med. 2010.

References

1. Sartorius D, et al. MGAP: a new simple prehospital triage score to predict mortality in trauma patients. Crit Care Med. 2010. — Primary publication, authoritative guideline or recognised specialty source.