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[目的]探讨血清降钙素原（PC T ）检测在儿科感染性疾病中的应用价值。[方法]选择2012年2月至2013年3月本科收治的77例疑似感染的患儿作为研究对象，按出院诊断标准分为细菌感染组、病毒感染组和非感染组，并进一步将细菌感染组分成重症感染组和局部感染组，比较各组间 PC T、C-反应蛋白（CRP）浓度和全血细胞计数（CBC）水平。[结果]细菌感染组PCT、CRP浓度和CBC水平均显著高于病毒感染组和非感染组，组间比较差异有显著性（ P ＜0．05）。细菌感染组中，PC T的阳性检出率为86．7％，显著高于CRP和CBC的阳性检出率，且差异有显著性（ P ＜0．05），重症感染组PCT 浓度显著高于局部感染组，组间比较差异有显著性（ P ＜0．05）。[结论]血清PC T水平可用于儿科诊断细菌感染及感染严重程度判别，具有一定临床应用价值。“,”[Objective] To explore the value of detection of serum procalcitonin in pediatric infectious dis-eases .[Methods] Totally 77 children suspected infection in our department from Feb .2012 to March 2013 were enrolled in the study .According to discharge diagnosis standard ,all patients were divided into bacterial infection group ,viral infection group and non-bacterial infection group .The bacterial infection group was fur-ther divided into severe bacterial infection group and local infection group .PCT ,C-reactive protein(CRP) and complete blood count(CBC) were compared among these groups .[Results] PCT ,CRP and CBC in bacterial infection group were markedly higher than those in viral infection group and non-bacterial infection group ,and there were significant differences among these groups( P<0 .05) .The positive detection rate of PCT in bacte-rial infection group was 86 .7% ,which was markedly higher than that of CRP and CBC ,and there were signif-icant differences( P <0 .05) .PCT level of severe bacterial infection group was markedly higher than that of local infection group ,and there was significant difference between two groups ( P <0 .05) .[Conclusion]Ser-um PCT can be used in the evaluation of bacterial infection and the severity of infection ,so it has certain clini-cal application value .