According to the ROC curve displayed, the maximum AUC related to AD was observed for the levels of total protein and albumin (AUC 0.80, 95% CI 0.74–0.84, p < 0.001), the identified cut-off values for total protein and albumin were 68.60 g/L and 41.90 g/L, respectively. Here, ALB is linked to Alzheimer disease.