GFAP and subarachnoid hemorrhage: A study of 270 subjects with acute neurological symptoms (AIS: 121, ICH: 34, stroke mimics: 31, subarachnoid haemorrhage: 5, controls: 79) for cut-off values of 0.43 ng/mL GFAP (taken within 6 h of symptom onset) showed a sensitivity of 91% and specificity of 97% (AUC 0.97) in differentiating ICH from AIS [33].