Modified Fisher Grading Scale for Subarachnoid Hemorrhage (SAH)
States severity of SAH based on amount and type of blood on CT with associated vasospasm risk.
This scale only applies to aneurysmal subarachnoid hemorrhage (aSAH).
- Thin SAH is classified as < 1mm in depth.
- Thick SAH is classified as ≥ 1mm in depth.
Clinician must be able to identify subarachnoid hemorrhage (SAH) and major neuroanatomical landmarks on head CT.
When to Use
No SAH present
Focal or diffuse thin SAH
Focal or diffuse thick SAH
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