BAT Score (hematoma expansion)
BAT score (0-5) for predicting intracerebral-hemorrhage expansion from the blend sign, hypodensity, and onset-to-CT timing.
Open the calculator → Runs in your browser. Data leaves only if you deliberately send a problem report from the interactive tool.
Example
- Blend sign present
- Yes
- Any intrahematoma hypodensity present
- Yes
- Onset-to-baseline-NCCT < 2.5 hours
- Yes
Result: BAT 5/5: BAT >= 3 -- predicts hematoma expansion (sensitivity ~0.50, specificity ~0.89).
The tool opens with these values already filled in. Replace them with your own.
What the result means
- Threshold
- a total of 3 or more predicts hematoma expansion with sensitivity about 0.50 and specificity about 0.89.
What you enter
- Blend sign present (+1)
- Any intrahematoma hypodensity present (+2)
- Onset-to-baseline-NCCT < 2.5 hours (+2)
How this is calculated
- Components
- Blend sign (+1), Any intrahematoma hypodensity (+2), Timing onset-to-NCCT < 2.5 h (+2); total 0-5.
Morotti A, Dowlatshahi D, Boulouis G, et al. Predicting intracerebral hemorrhage expansion with noncontrast computed tomography: the BAT score. Stroke. 2018;49(5):1163-1169. Read the source ↗
A reference and educational tool. Not medical, legal, or financial advice, and not a substitute for clinician judgment.