Sepsis, a syndrome of physiologic pathologic and biochemical abnormalities induced by infection, is a major public health concern. The concept of sepsis changed as time goes by. According to the Third International Consensus Definitions for Sepsis and Septic Shock, sepsis is defined as a life-threatening organ dysfunction caused by a dysregulated host response to infection. So far, the number of patients suffering from sepsis has been on rise. However, the diagnosis of sepsis is still difficult.