Fisher Grading Scale for Subarachnoid Hemorrhage (SAH)
Rates risk of vasospasm in aSAH based on amount and distribution of blood on CT.
INSTRUCTIONS
This scale only applies to aneurysmal subarachnoid hemorrhage (aSAH). We recommend using the Modified Fisher Grading Scale based on more recent studies.
Clinician must be able to identify subarachnoid hemorrhage (SAH) and major neuroanatomical landmarks on head CT.
When to Use
Pearls/Pitfalls
Why Use
No SAH detected
Diffuse or vertical layer of subarachnoid blood < 1mm thick
Localized clot and/or vertical layer within the subarachnoid space > 1mm thick
Intracerebral hemorrhage (ICH) or intraventricular hemorrhage (IVH) with diffuse or no SAH
Result:
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