Emergency Medicine · Neurology
Ottawa Subarachnoid Hemorrhage Rule calculator
Enter the published formula inputs below to calculate and interpret this score.
Clinical inputs
Result
0
Ottawa SAH rule low-risk count (0 criteria)
Interpret only within the cited source population and criteria; use alongside complete clinical assessment.
Formula inputs
- age ge 40
- neck pain or stiffness
- arrival by ambulance
- witnessed loss of consciousness
- onset during exertion
- thunderclap headache
- limited neck flexion
Primary source
Perry JJ et al. Clinical decision rules to predict subarachnoid hemorrhage in patients with acute headache. CMAJ. DOI: 10.1503/cmaj.091816. PMID: 20530183. Scope: count of high-risk Ottawa SAH predictors (age ≥40, neck pain/stiffness, ambulance arrival, witnessed LOC, exertional onset, thunderclap headache, limited neck flexion); 0 criteria indicates low-risk classification in the derivation/validation cohorts. (2010)
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