CALCA and Sepsis: With the accumulative application of related biological molecular theories in clinical diagnosis, it is believed that changes in some indicators may help doctors to determine the severity and changes of the disease, and indicators such as PCT and DD are of great value in the early diagnosis of sepsis.8 In the present study, the levels of PCT, DD and FIB were monitored in children with sepsis, and evaluated the clinical value of combined detection of PCT, DD and FIB in the evaluation of children with sepsis.