CALCA and Sepsis: The area under the curve (AUC) for NLR, PCT, and APACHE II scores to predict 28 days death in patients with bloodstream infection and sepsis were 0.791 (95% CI: 0.714–0.868), 0.830 (95% CI: 0.758–0.902), and 0.718 (95% CI: 0.636–0.800), respectively, all with P < 0.05 (Table 5; Figure 2).