CALCA and acute kidney injury: Feng et al. showed the sensitivity (76%) and specificity (75%) of PCT in predicting AKI (OR 9.63, 95% CI, 95% 4.38–21.18) [43], and Chun et al. [44] reported that in septic patients hospitalized in an intensive care unit (ICU), PCT was significantly high (p < 0.001) and was associated with AKI (OR 1.006, 1,000–1,011; p = 0,035).