Ottawa Subarachnoid Hemorrhage (SAH) Rule
Rule Inclusion Criteria
<-- Age 15 years or over
<-- New, severe nontraumatic headache
<-- Headache reached maximum intensity within 1 hour
<-- Neurologic deficits
<-- Previous aneurysms
<-- History of recurrent headaches (3 or more episodes in the last 6 or more months)
High Risk Variables
<-- Age 40 years or over
<-- Neck pain or stiffness
<-- Witnessed loss of consciousness
<-- Onset during exertion
<-- Thunderclap headache (instantly peaking pain)
<-- Limited neck flexion on examination

Interpretation --> Interpretationscore=(QA)+(QB)+(QC)+(QD)+(QE)+(QF)+(Q1)+(Q2)+(Q3)+(Q4)+(Q5)+(Q6);score>9?'Does not meet rule inclusion criteria. Ottawa SAH Rule may not be used.':score>0?'Meets Inclusion Criteria AND Has High Risk Variables. Further investigation for Subarachnoid Hemorrhage is recommended per Ottawa SAH Rule':'Meets Inclusion Criteria AND Has No High Risk Variables. Further investigation for Subarachnoid Hemorrhage may not be necessary.'
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