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    Patent Pending

    Injury Severity Score (ISS)

    Standardizes severity of traumatic injury based on worst injury of 6 body systems.
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    The ISS attempts to standardize trauma severity to help trauma centers predict outcomes.
    When calculating the ISS manually, there are two steps (see Formula). An experienced trauma provider should rate the severity of each body system injury.

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    Management

    As in all trauma patients, initial strategy should focus on the primary and secondary survey and assessing and stablilizing the ABCs.

    Formula

    Assign an Abbreviated Injury Scale (AIS) Score to the most severe injury in each body system as follows:

    Severity

    AIS

    Minor

    1

    Moderate

    2

    Serious

    3

    Severe

    4

    Critical

    5

    Unsurvivable

    6

    Then, if the 3 most severe injuries in 3 body systems are A, B, and C, then

    ISS = A² + B² + C²

    If a patient has an AIS of 6 in any body system, they are automatically assigned an ISS of 75.

    Dr. Susan Baker

    About the Creator

    Susan Baker, MPH, is an professor and epidemiologist specializing in injury prevention at Johns Hopkins Bloomberg School of Public Health and was the first director of the Center for Injury Research and Policy. She is well known for authoring the Injury Fact Book. Professor Baker's teaching and research is aimed at influencing policy changes that will reduce the likelihood of injury for thousands of people.

    To view Dr. Susan Baker's publications, visit PubMed