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PHASES Score

PHASES Score Calculator

5-Year Aneurysm Rupture Risk Assessment

Population

Hypertension

Age

Size of Aneurysm

Earlier SAH

Site of Aneurysm

Total Score: 0

5-Year Rupture Risk: 0.4%

Low Risk

Clinical Recommendations

• Score ≤2: Consider conservative management with regular monitoring

• Score 3-6: Individual risk assessment needed; consider patient factors

• Score 7-11: Consider intervention based on patient factors

• Score ≥12: Strong consideration for intervention

Validated only in North American, European, Japanese, and Finnish populations. Use clinical judgment in conjunction with score results.

Guidelines & Evidence

Verified

Last Review: 2026-07-17

When to Use

How it Works

Clinical Pearls

Next Steps

The Evidence

Origins & History

Last Comprehensive Review: 2026-07-17

Recent Journal Updates

British J Clinical PharmacologyJul 22, 2026
CHATD Questionnaire: Development, Validation and Evaluation of Child and Parent Attitudes Towards Deprescribing

Clinical Context

We think this has broad domain relevance to PHASES Score (Unruptured Aneurysm).

Alzheimers & DementiaJul 22, 2026
Prognostic value of plasma %p‐tau217 in cognitively unimpaired older adults

Clinical Context

We think this has broad domain relevance to PHASES Score (Unruptured Aneurysm).

WHO NewsJul 21, 2026
UN report: Global hunger levels ease for third consecutive year as regional disparities persist

Clinical Context

We think this has broad domain relevance to PHASES Score (Unruptured Aneurysm).