Ottawa Subarachnoid Hemorrhage Rule
Ottawa Subarachnoid Hemorrhage Rule - a deterministic tool in Sophie Well's Clinical Scoring & Risk group.
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What this is
Ottawa Subarachnoid Hemorrhage Rule is one of 230 deterministic tools in Sophie Well's Clinical Scoring & Risk group. Ottawa Subarachnoid Hemorrhage Rule - a deterministic tool in Sophie Well's Clinical Scoring & Risk group.
When to use it
Use this tool when you need a quick, citable reference. Every calculation runs entirely in your browser - no inputs leave your device, no account is required, no AI is involved. The site enforces a strict Content Security Policy and ships no analytics or third-party CDN.
References
Perry JJ, Stiell IG, Sivilotti MLA, et al. Clinical decision rules to rule out subarachnoid hemorrhage for acute headache. JAMA. 2013;310(12):1248-1255.
Worked example: Rule out SAH by Ottawa SAH Rule: all six criteria negative per Perry 2013 (100% sensitivity in the derivation cohort).
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