Procalcitonin (PCT), also known as procalcitonin, is an important parameter for the diagnosis and monitoring of bacterial inflammatory disease infections. The determination of PCT can be used as an acute parameter to differentiate and diagnose bacterial and non-bacterial infections and inflammations; to monitor patients at risk of infection and patients in need of intensive care; to detect the systemic effects of bacterial infections or detect sepsis complications And evaluation of the clinical course and prognosis of severe inflammatory diseases (for reference only).