CALCA and Sepsis: However, no study has reported the predictive effectiveness of PCT level in post-surgical sepsis as well as mortality rates in pediatric patients, with the exception of a new study in almost the same setting in Saudi Arabia done by Waleed B., et al. [9], which reported five years’ knowledge of diagnostic mortality using the procalcitonin level method for detection based on 400 patients who were admitted to PICU on mechanical ventilator.