Early Serum Calprotectin (S100A8/A9) Predicts Delayed Cerebral Ischemia and Outcomes after Aneurysmal Subarachnoid Hemorrhage.

•Propose for the first time that the level of serum calprotectin elevated in patients with subarachnoid hemorrhage (SAH) and calprotectin is an early inflammatory factor within 48 hours after ASAH.•Propose for the first time that Serum calprotectin can be used as an independent predictor of DCI after aSAH.•Propose for the first time that Serum calprotectin can be used as an independent predictor of the prognosis of aSAH.