Objective To test the predicative roles of neutrophil gelatinase-associated lipocalin (NGAL) and kidney injury molecule-1( KIM-1 ) for acute kidney injury (AKI) in critically ill patients. Methods Children from pediatric intensive care unit, were randomly divided into four groups:critically ill patients with AKI (group 1 ), critically ill patients with non-AKI (group 2) , chronic kidney disease group (group 3), healthy control group (group 4). 1.5 ml venous blood and urine specimens were collected and kept under-70°C. Serum creatinine , urine NGAL and urine KIM-1 were analyzed. Results Compared with group 2, group 3 and group 4, the urine NGAL and urine KIM-1 increases obviously in group 1 (P<0.05). There is no signiifcance of urine NGAL and urine KIM-1 between group2, group3 and group 4 (P>0.05). The concentration of urine NGAL increased more than 10 times of base-line level 2 days before the diagnosis of AKI under the Acute Kidney Injury Network standard with area under curve (AUC) 0.955 (P<0.05) , and the concentration of urine KIM-1 increased more than 5 times of base-line level 1 day before AKI with AUC 0.878 (P<0.05). The AUC was 0.984 (P<0.01) when they were combined. There is negative correlation between the increased times of urinary KIM-1, urinary NGAL and vally value of creatin clearance rate. Conclusions The concentrations of urine NGAL and urine KIM-1 are useful early biomarkers for predicting AKI, especially when they were combined.%目的：探讨尿中性粒细胞明胶酶相关脂质运载蛋白(NGAL)和尿肾损伤分子-1(KIM-1)在预测重症患儿急性肾损伤(AKI)中的意义。方法以慢性肾病(CKD)患儿、重症患儿为研究对象，随机分为重症AKI组(n=27)，重症非AKI组(n=30)，CKD组(n=30)，以健康体检儿童为对照组(n=30)，测定比较尿NGAL和KIM-1水平以及其他生化指标。结果重症AKI组的尿NGAL在AKI发生前2天(第-2天)已达峰值，比第-3天的基础值升高超过10倍，并在AKI发生后第2天降至基础值；KIM-1水平在AKI发生前1天(第-1天)升至峰值，比第-3天的基础值升高超过5倍，并保持升高至AKI发生后2 d；NGAL、KIM-1水平随时间变化(-3d~2d)的差异均有统计学意义(P均<0.01)。重症非AKI组、CKD组、对照组的尿NGAL和KIM-1水平随时间变化的差异均无统计学意义(P>0.05)。尿KIM-1、NGAL单独作为标记物诊断AKI时，受试者工作特征曲线(ROC曲线)曲线下面积(AUC)分别为：0.878和0.955(P<0.01)，而联合二者诊断AKI时，AUC为0.984(P<0.01)。尿KIM和NGAL升高倍数和CCr谷值呈负相关，Spearman相关系数分别为-0.68和-0.74(P<0.01)。结论联合检测尿NGAL和KIM-1水平可能有助于预测AKI。
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