PHASES Score (5-year aneurysm rupture risk) — free guideline decision tool
Estimate the 5-year rupture risk of an unruptured intracranial aneurysm with the PHASES score.
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 PHASES Score (5-year aneurysm rupture risk) do?
Weigh observation vs intervention for unruptured intracranial aneurysms.
How is the result calculated?
Points from Population, Hypertension, Age ≥ 70, Size, Earlier SAH and Site. Total maps to an approximate 5-year rupture risk (0.4% at low scores to ~ 17.8% at ≥ 12).
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 PHASES Score (5-year aneurysm rupture risk) now
Estimate the 5-year rupture risk of an unruptured intracranial aneurysm with the PHASES score.
Open guideline tool →For licensed clinicians. Not a substitute for clinical judgement.