检验医学 ›› 2013, Vol. 28 ›› Issue (5): 408-411.DOI: 10.3969/j.issn.1673-8640.2013.05.015

• 技术研究与评价.论著 • 上一篇    下一篇

两种检测系统测定血清半胱氨酸蛋白酶抑制剂C的偏差评估

戴悦1,吴文清2   

  1. 1.上海市第八人民医院检验科,上海 200235;2.复旦大学附属华山医院检验科,上海 200040
  • 收稿日期:2012-09-07 修回日期:2012-12-06 出版日期:2013-05-15 发布日期:2013-05-14
  • 作者简介:戴悦,女,1981年生,学士,技师,主要从事生化、免疫检验工作。

Evaluation on the bias of two detection systems for serum cystatin C

  1. 1.Department of Clinical Laboratory,Shanghai Eighth People′s Hospital,Shanghai 200235,China; 2. Department of Clinical Laboratory,Huashan Hospital,Fudan University,Shanghai 200040,China
  • Received:2012-09-07 Revised:2012-12-06 Online:2013-05-15 Published:2013-05-14

摘要: 目的 对液相透射比浊检测系统和颗粒增强散射比浊检测系统测定半胱氨酸蛋白酶抑制剂C(Cys C)结果偏差进行方法学比较及偏差评估。方法 按照美国临床实验室标准化委员会(NCCLS)EP9-A2文件,以 40例血清标本分别在罗氏MODULAR P800全自动生化分析仪和西门子BN-II特定蛋白分析仪上进行双份重复测定。将测定数据结果进行离群点检查,线性回归分析,计算预期偏差及可信区间(CI)。结果 2种检测系统Cys C测定结果的相关回归方程为Y=1.216X-0.139,r 2=0.978。浓度为0.53、0.95 mg/L时,允许误差在预期偏差95%CI范围内;Cys C浓度为7.85 mg/L时,允许误差<预期偏差95%CI下限。结论 2种检测系统的测定结果呈线性相关。在低浓度时,预计偏差可以接受。在高浓度时,测定结果不一致,预期偏差不可以接受。

关键词: 半胱氨酸蛋白酶抑制剂C, 液相透射比浊系统, 颗粒增强散射比浊系统, 偏差

Abstract: Objective To compare methodologically and evaluate the bias of turbidimetric assay and particle-enhanced nephelometric assay for serum cystatin C(Cys C). Methods According to the National Committee for Clinical Laboratory Standards (NCCLS) EP9-A2 document,40 serum samples were determined in duplicate measurement by Roche MODULAR P800 automatic biochemical analyzer and Siemens BN-Ⅱ specific protein analyzer, respectively. The data were used to check outliers,linear regression was analyzed,and the predictive bias and confidence interval(CI) were calculated. Results The linear regression equation was Y=1.216X-0.139,r 2=0.978. When the Cys C concentrations were 0.53 mg/L and 0.95 mg/L,the acceptable biases were in the range of 95%CI of predictive bias. However, when the Cys C concentration  was 7.85 mg/L,the acceptable bias was<the low limit of 95%CIof predictive bias. Conclusions The results of the 2 detection systems have linear correlation. The predictive bias of measured results between the 2 detection systems is acceptable except the high concentration.

Key words: Cystatin C, Turbidimetric assay, Particle-enhanced nephelometric assay, Bias