Modified Fisher Scale (SAH Vasospasm Risk) — free guideline decision tool
Estimate cerebral vasospasm risk after SAH with the modified Fisher scale.
Open guideline tool →Guideline-based
Implements the decision logic from published clinical guidelines.
Runs in your browser
No installation. Enter the patient's values and get a guideline recommendation instantly.
Data stays local
Nothing is uploaded. Results are for licensed clinicians only.
Common questions
What does Modified Fisher Scale (SAH Vasospasm Risk) do?
Predict symptomatic vasospasm from the CT bleed pattern.
How is the result calculated?
Grades 0–4 based on thickness of subarachnoid blood and presence of intraventricular haemorrhage. Higher grades carry higher vasospasm risk.
Is this a substitute for clinical judgement?
No. All results are decision-support only, for licensed clinicians. They must be individualized to the whole patient and the latest guideline version.
Run Modified Fisher Scale (SAH Vasospasm Risk) now
Estimate cerebral vasospasm risk after SAH with the modified Fisher scale.
Open guideline tool →For licensed clinicians. Not a substitute for clinical judgement.