Abstract： Objective To investigate the value of serum presepsin concentration measurement in the clinical diagnosis and treatment of patients with pesticide poisoning patients.Methods A total of 160 patients with pesticide poisoning were enrolled as study subjects and divided into moderate organophosphate pesticide poisoning group (40 patients),severe organophosphate pesticide poisoning group (40 patients),abamectin pesticide poisoning group (40 patients),and paraquat poisoning group (40 patients).A total of 20 healthy volunteers were enrolled as the control group.All the patients with poisoning received conventional treatment of pesticide poisoning immediately after admission,and serum presepsin concentration was measured on days 1 (within 24 hours after poisoning),3,and 7 of admission,and biochemical and radiological parameters related to the patient' s condition were also examined.The patients with a Presepsin concentration of ＞800 pg/ml on day 1 of admission were randomly divided into conventional treatment group and ulinastatin treatment group,and the treatment outcome was compared between the two groups.Results Compared with the healthy control group,the groups with pesticide poisoning showed significant increases in serum Presepsin concentrations,with the highest degree of increase on day 1 (P ＜0.05).The serum Presepsin concentration was positively correlated with alanine aminotransferase,aspartate aminotransferase,creatine kinase,creatine kinase MB,lactate dehydrogenase,serum creatinine,blood urea nitrogen,interleukin-18,and white blood cell count,but negatively correlated with cholinesterase.In the conventional treatment group and ulinastatin treatment group,the overall response rate was 68％ and 78.8％,respectively,with a significant difference between the two groups (P＜0.05).In 40 patients with paraquat poisoning,32 experienced an increase in serum presepsin concentration,and among these 32 patients,27 (83％) experienced exudation on lung CT.Conclusion Serum Presepsin concentration measurement can assist early diagnosis,evaluation of disease severity,and guidance for clinical medication in patients with pesticide poisoning,especially in those with severe pesticide poisoning and a tendency to multiple organ failure.