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Emergency Medicine · Neurology

Ottawa Subarachnoid Hemorrhage Rule calculator

Enter the published formula inputs below to calculate and interpret this score.

Clinical inputs

Result

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0

Ottawa SAH rule low-risk count (0 criteria)

Band: Ottawa SAH rule low-risk count (0 criteria)

Interpretation. Ottawa SAH rule low-risk count (0 criteria)

Suggested management. Interpret only within the cited source population and criteria; use alongside complete clinical assessment.

Ottawa Subarachnoid Hemorrhage Rule: 0 — Ottawa SAH rule low-risk count (0 criteria). Interpretation: Ottawa SAH rule low-risk count (0 criteria) What to do: Interpret only within the cited source population and criteria; use alongside complete clinical assessment. Inputs: age ge 40: false; neck pain or stiffness: false; arrival by ambulance: false; witnessed loss of consciousness: false; onset during exertion: false; thunderclap headache: false; limited neck flexion: false 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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Clinical 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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