Decision Rule - Ottawa Subarachnoid Hemorrhage (SAH) Rule

Ottawa Subarachnoid Hemorrhage (SAH) Rule:

-Age ≥40 . . . . . . . . . . . . . . . . . . . . . . . . . . .  [No (0 points)/Yes (+1 point)]
-Neck pain or stiffness   . . . . . . . . . . . . . . .  [No (0 points)/Yes (+1 point)]
-Witnessed loss of consciousness . . . . . . .  [No (0 points)/Yes (+1 point)]
-Onset during exertion  . . . . . . . . . . . . . . .  [No (0 points)/Yes (+1 point)]
-Thunderclap headache   . . . . . . . . . . . . . .  [No (0 points)/Yes (+1 point)]
  (Defined as headache peaking within 1 second)  
-Limited neck flexion on examination . . . .  [No (0 points)/Yes (+1 point)]

TOTAL SCORE = [## points]

A subarachnoid hemorrhage (SAH) cannot be ruled out if one or more criteria above are met.  
Provider may consider avoiding further subarachnoid hemorrhage (SAH)-specific workup in patients who meet all negative criteria.

https://www.mdcalc.com/ottawa-subarachnoid-hemorrhage-sah-rule-headache-evaluation