C-STAT / CPSSS (prehospital LVO severity)
Cincinnati Prehospital Stroke Severity Scale / C-STAT (Katz 2015).
Open the calculator → Runs in your browser. Data leaves only if you deliberately send a problem report from the interactive tool.
Example
- Conjugate gaze deviation
- Yes
Result: C-STAT / CPSSS 2/4: a total >= 2 predicts a large-vessel occlusion -- consider comprehensive-stroke-center triage per protocol.
The tool opens with these values already filled in. Replace them with your own.
What the result means
- Threshold
- a total of 2 or more predicts a large-vessel occlusion (about 89%/73% for severe stroke in derivation; about 70%/87% for occlusion in external validation).
What you enter
- Conjugate gaze deviation (+2)
- LOC questions / commands incorrect (+1)
- Severe arm weakness (+1)
How this is calculated
- Components
- conjugate gaze deviation (+2), LOC questions/commands incorrect (+1), severe arm weakness (+1); total 0-4.
Katz BS, McMullan JT, Sucharew H, Adeoye O, Broderick JP. Design and validation of a prehospital scale to predict stroke severity: Cincinnati Prehospital Stroke Severity Scale. Stroke. 2015;46(6):1508-1512. Read the source ↗
A reference and educational tool. Not medical, legal, or financial advice, and not a substitute for clinician judgment.