检验医学 ›› 2012, Vol. 27 ›› Issue (2): 122-125.

• 生物化学检验论著 • 上一篇    下一篇

胶乳增强免疫比浊法测定胃蛋白酶原Ⅱ的不精密度和线性观察

  

  1. 中山大学附属第一医院检验医学部,广东 广州 510080
  • 出版日期:2012-02-28 发布日期:2012-02-19
  • 作者简介:高 玲,女,1959年生,学士,副主任技师,主要从事临床生化检测与质量控制的研究。

The observation of imprecision and linearity on detection of pepsinogen Ⅱby latexenhanced immunoturbidimetry assay

  1. Department of Clinical Laboratory,the First Affiliated Hospital of Sun Yatsen University,Guangdong Guangzhou 510080,China
  • Online:2012-02-28 Published:2012-02-19

摘要: 目的 对胶乳增强免疫比浊法测定胃蛋白酶原Ⅱ(PGⅡ)进行初步方法学评价,为临床应用提供依据。方法 依据美国临床实验室标准化委员会(NCCLS)EP5A及EP10A2文件提供的方法,对胶乳增强免疫比浊法测定PGⅡ进行初步的评价。结果 PGⅡ的低值样本批内变异系数(CV)为 2.05%、批间 CV为 1.60%、日间 CV为 3.92%、总 CV为 4.70%;高值样本批内 CV为 1.70%、批间 CV为 1.21%、日间 CV为 3.79%、总 CV为 4.32%。当PGⅡ浓度分别为9.6、24.7、39.8 μg/L时,相对偏倚分别为-0.18、-0.47、-0.39 μg/L,总不精密度分别为4.98%、2.39%、2.71%。测试间的携带污染差异无统计学意义(P>0.05)。线性回归方程为Y =0.975 7X -0.016 8,决定系数(R2)=0.998 7。结论 胶乳增强免疫比浊法测定PGⅡ的精密度符合EP5A文件标准,具有良好的重复性。线性、偏倚、总不精密度及抗交叉污染能力均达到EP10A2文件标准,符合临床应用要求,适用于实验室常规测定。

关键词: 胃蛋白酶原Ⅱ, 胶乳增强免疫比浊法, EP5-A文件, EP10-A2文件, 方法学评价

Abstract: Objective To evaluate primarily the detection of pepsinogen Ⅱ (PGⅡ) by latexenhanced immunoturbidimetry assay, and provide the reference for clinical application. Methods According to the National Committee for Clinical Laboratory Standards (NCCLS) EP5A and EP10A2 documents, the detection of PGⅡ by latexenhanced immunoturbidimetry assay was evaluated primarily. Results The withinrun, betweenrun,betweenday and total coefficients of variation (CV) of samples with low concentration of PGⅡ were 2.05%,1.60%,3.92% and 4.70% respectively. The withinrun, betweenrun,betweenday and total CV of samples with high concentration of PGⅡ were 1.70%,1.21%,3.79% and 4.32% respectively.When PGⅡ concentrations were 9.6, 24.7 and 39.8 μg/L,the relative biases were -0.18,-0.47 and -0.39 μg/L respectively. The total imprecisions were 4.98%, 2.39% and 2.71% respectively. There was no statistical significance in total carryover (P>0.05). The equation of linear regression of PGⅡ was Y =0.975 7X -0.016 8,and the coefficient of determination(R2)= 0.998 7. Conclusions The latexenhanced immunoturbidimetry assay for the PGⅡ detection with good repeatability meets the clinical application requirements of EP5A document for precision and the requirements of EP10A2 document for the linearity, bias, total imprecision and carryover. It is suitable for the clinical application.

Key words: Pepsinogen Ⅱ, Latexenhanced immunoturbidimetry assay, EP5-A document, EP10-A2 document, Methodology evaluation