SAH Fisher Grade


The Fisher grading scale classifies the appearance of subarachnoid hemorrhage on CT scan and is used in predicting cerebral vasospasm.

The development of clinical vasospasm within each grade has been reported as follows:

  • Grade 1 = 0%
  • Grade 2 = 7%
  • Grade 3 = 35%
  • Grade 4 = 21%


The SAH Fisher Grade calculator is created by QxMD.

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1. Appearance of Hemorrhage?

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