CALCA and Sepsis: In the derivation cohort, AUROC analysis for differentiating survivors from non survivors in the group of patients with sepsis showed the following results: [AUROC, (confidence interval 95%), p]: PCT [0.78, (0.68–0.77) <0.001]; PCT/HLA-DRA [0.79, (0.70–0.89), <0.001].