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Fischer scale

Dr Yuranga Weerakkody and Dr Frank Gaillard et al.

The Fischer scale is a way of grouping subarachnoid haemorrhage CT scans into four goups according to the amount of blood, and is useful in predicting cerebral vasospasm.

group 1 : no blood detected
group 2 : diffuse thin (< 1 mm) SAH with no clots.
group 3 : localised clots and / or layers of blood > 1 mm in thickness
group 4 : intracerebral or intraventricular blood (+/- SAH)