CALCA and Cholecystitis, Acute: Fransvea et al. [120] also demonstrated that, in patients with acute cholecystitis, having a PCT value > 0.09 ng/mL upon ED admission had a sensitivity of 84.8% [68.1–94.9] and a specificity of 51.8% [43.2–60.3] for the occurrence of a major complication during the remainder of the stay.