The area under the curve (AUC) values for distinguishing delirium from non-AD controls were 0.78 (95% CI 0.63–0.92) for NFL, 0.74 (95% CI 0.58–0.90) for tTau, and 0.77 (95% CI 0.61–0.93) for NFL/NPTX2 ratio. Here, NEFL is linked to Alzheimer disease.