Neurology · ICU and Critical Care
IMPACT Score for Traumatic Brain Injury calculator
Enter the published formula inputs below to calculate and interpret this score.
Clinical inputs
Allowed range: 0–120 years
Younger than 30 scores 0. 31 through 39 scores 1. Then 2, 3, and 4 for the next decades. 70 or older scores 5. Age exactly 30 is printed on two rows and is not scored.
Allowed range: 18.02–900.9 mg/dL
Allowed range: 3–22 g/dL
Result
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Clinical inputs
- Age in yearsAccepted range: 0 to 120
- Motor score
- Pupil reaction
- Hypoxia
- Low blood pressure
- Marshall CT class
- Traumatic subarachnoid hemorrhage
- Epidural hematoma
- Blood glucose (mmol/L)Accepted range: 1 to 50
- Blood hemoglobin (g/dL)Accepted range: 3 to 22
Primary source
Steyerberg EW et al. Predicting outcome after traumatic brain injury: development and international validation of prognostic scores based on admission characteristics. PLoS Med. DOI: 10.1371/journal.pmed.0050165. PMID: 18684008. Core points: age bands from younger than 30 through 70 or older, motor score, and pupils. The extended model adds hypoxia, hypotension, Marshall CT class, traumatic subarachnoid hemorrhage, and epidural hematoma. The laboratory model adds glucose and hemoglobin. Six-month mortality and unfavorable outcome use the six printed linear predictors. Unfavorable outcome is Glasgow Outcome Scale 1–3. Age exactly 30 is printed on two rows and is not scored. (2008)
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