injury_severity_score: Injury Severity Score (ISS)

In cliot: Clinical Indices and Outcomes Tools

Injury Severity Score (ISS)

Description

Calculates the Injury Severity Score (ISS) based on the Abbreviated Injury Scale (AIS). The ISS is an anatomical scoring system that provides an overall score for patients with multiple injuries. It is calculated as the sum of the squares of the highest AIS code in each of the three most severely injured body regions.

Usage

injury_severity_score(head_neck_ais, face_ais, chest_ais, abdomen_pelvis_ais,
                      extremities_pelvic_girdle_ais, external_ais)

Arguments

head_neck_ais	Numeric (0-6). Highest AIS severity code for the Head or Neck region.
face_ais	Numeric (0-6). Highest AIS severity code for the Face region.
chest_ais	Numeric (0-6). Highest AIS severity code for the Chest region.
abdomen_pelvis_ais	Numeric (0-6). Highest AIS severity code for the Abdominal or Pelvic contents region.
extremities_pelvic_girdle_ais	Numeric (0-6). Highest AIS severity code for the Extremities or Pelvic Girdle region.
external_ais	Numeric (0-6). Highest AIS severity code for External injuries.

Details

AIS Severity Codes: 1: Minor 2: Moderate 3: Serious 4: Severe 5: Critical 6: Maximal (Unsurvivable)

If any region has an AIS score of 6, the ISS is automatically assigned as 75.

Value

A list containing:

ISS_Score	The calculated score (Range 1-75).
Classification	Trauma severity classification (Minor <9, Moderate 9-15, Serious 16-24, Severe >24).

References

Baker SP, O'Neill B, Haddon W Jr, Long WB. The injury severity score: a method for describing patients with multiple injuries and evaluating emergency care. J Trauma. 1974;14(3):187-196.

Examples

# Example 1: Major Trauma
# Head 4, Chest 3, Abdomen 2, others 0
# Score = 4^2 + 3^2 + 2^2 = 16 + 9 + 4 = 29
injury_severity_score(4, 0, 3, 2, 0, 0)

# Example 2: Automatic 75
# Head 6 (Unsurvivable)
# Score = 75
injury_severity_score(6, 2, 2, 0, 0, 0)

cliot documentation built on Dec. 1, 2025, 1:06 a.m.