小儿肺炎是儿童期的常见病,多发病。小儿肺炎按病因分有细菌性肺炎、病毒性肺炎、支原体肺炎和吸入性肺炎等。其中尤其以3岁以内的婴幼儿在冬春季节发病最多。如果得不到正确的诊断与及时的治疗,极易发展为重症肺炎或迁延性肺炎,轻则影响发育,重则危及生命。在我国以细菌性肺炎为主[1],故及时的鉴别诊断和正确的治疗是非常有必要的。以往肺炎的实验室诊断有白细胞计数与分类、C反应蛋白及细菌培养等,但都存在一些问题,如白细 Pediatric pneumonia is a common childhood disease, frequently-occurring disease. According to the cause of pediatric pneumonia, there are bacterial pneumonia, viral pneumonia, mycoplasma pneumonia and aspiration pneumonia. Especially among infants and young children within 3 years of age in winter and spring incidence most. If you can not get the correct diagnosis and timely treatment, it is easy to develop severe pneumonia or persistent pneumonia, ranging from the impact of development, while life-threatening. In our country mainly bacterial pneumonia [1], so timely differential diagnosis and correct treatment is very necessary. Previous pneumonia laboratory diagnosis of white blood cell count and classification, C-reactive protein and bacterial culture, but there are some problems, such as white