WFNS Scale: World Federation of Neurosurgical Societies Subarachnoid Hemorrhage Scale

The WFNS Scale is a standardized grading system for assessing severity and prognosis in subarachnoid hemorrhage (SAH) published by the World Federation of Neurosurgical Societies in 1988. The five-point scale combines the Glasgow Coma Scale (GCS) with presence of motor deficit to classify SAH severity. The WFNS Scale is more objective than the earlier Hunt-Hess Scale and is increasingly preferred in contemporary neurosurgical practice, particularly in Europe and internationally.