Abstract: Abstract Objective The aim of this research is to evaluate the diagnostic value of PCT in neonates with severe bacterial infectious disease.Methods 229 neonates admitted to Neonatology Department,Tianjin Children’s Hospital since March to December 2002 were divided into 4 groups:noninfection control(116),systemic bacterial infection (39),localized bacterial infection (51) and viral infection (23).Serum PCT and CRP were measured on admission;leucocyte count and differentiation was measured within 24 hours after admission.A serial measurement of PCT and CRP were taken during the course when necessary.Analyze data using SPSS 10.0 for Windows.Results Although both PCT and CRP significantly elevated in neonates with systemic bacterial infection,PCT revealed more sensitivity in systemic bacterial infection (P<0.001).The sensitivity and specificity of PCT to diagnose neonatal systemic bacterial infection using a cut off level 2 (μg/L) was 0.804 and 0.824,respectively.Conclusion PCT is a better diagnostic marker of neonatal systemic bacterial infection than CRP and leucocyte count.

Key words: Infant,neonate , Infection, C-reactive protein

摘要： 目的 探讨降钙素原(PCT)在新生儿重症感染时的诊断价值。方法 将自2002年3~12月于天津市儿童医院新生儿科住院的229例新生儿分别归入无感染对照组(116例)，全身感染组(39例)，局部感染组(51例)和病毒感染组(23例)。检测入院时血清PCT和C-反应蛋白(CRP),白细胞计数及分类。用SPSS 10.0 For Windows进行数据分析。结果 在全身感染时，血清PCT和CRP质量浓度升高均有显著性，但PCT显著性更高(P<0.001)。PCT≥2μg/L作为全身感染的诊断依据，其敏感度(0.804)和特异度(0.824)均优于CRP。结论 与CRP和白细胞计数相比,PCT是一个较好的新生儿全身细菌感染的诊断指标。

关键词: 降钙素原, 感染, C-反应蛋白, 婴儿, 新生