Fisher Grading Scale for Subarachnoid Hemorrhage (SAH)
Rates risk of vasospasm in aSAH based on amount and distribution of blood on CT.
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.
Diagnostic Result
Charles Miller Fisher, MD, (d. 2014), was Professor Emeritus at Harvard Medical School, where he spent 50 years as a teacher and clinician. He was an active researcher in stroke neurology and is credited with identifying and naming transient ischemic attacks (TIA). He was a founder of the Massachusetts General Hospital Stroke Service and was inducted into the Canadian Medical Hall of Fame.
- Benjamin Kummer, MD