Abstract: This article exploreed the value of pulmonary ultrasound in the diagnosis of children with pulmonary infection and its correlation with serum procalcitonin (PCT) and pediatric critical illness score (PCIS). A total of 120 children with pulmonary infection (infection group) and 120 healthy children (control group) who underwent child care during the same period were selected. Both groups received pulmonary ultrasound examination. The LUS score and serum PCT of the infection group were significantly higher than those of the control group (P<0.05), and the PCIS score of the infection group was lower than that of the control group (P<0.05). After simple linear correlation analysis, in the infection group there was a significant positive correlation between the LUS score and serum PCT (r=0.704, P=0.000<0.05), and the LUS score and PCIS score were significantly negatively correlated (r=－0.742, P=0.000<0.05). The sensitivity of LUS score to diagnose children with pulmonary infection was 82.76%, specificity was 76.60%, and the area under the ROC curve was 0.845. Pulmonary ultrasound diagnosis of children with pulmonary infection has high clinical value, and has a good correlation with PCIS score and PCT. This examination method has benefits of being non-radioactive, safety and reliability.

Key words: pulmonary ultrasound, pulmonary infection, procalcitonin, pediatric critical illness score