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Establishment of a reference procedure to measure urine-formed elements and evaluation of an automated urine analyzer.
Scandinavian Journal of Clinical and Laboratory Investigation ( IF 1.3 ) Pub Date : 2019-10-30 , DOI: 10.1080/00365513.2019.1680860
Rui Zhang 1 , Huaian Ma 2 , Huimin Yuan 1 , Hongyan Guo 3 , Bingxin Jiao 4 , Yan Zhang 5 , Xi Zhang 5 , Huidong Dou 6 , Zhiqi Gao 1 , Qingtao Wang 1, 7
Affiliation  

A standardized reference method is needed to accurately and precisely measure urine-formed elements (UFEs; red blood cells [RBCs], white blood cells [WBCs], and squamous epithelial cells [sECs]). We compared the results from a standard method with those from an automated analyzer. Trained technicians used standardized bright-field microscopy of fresh non-centrifuged urine samples, and disposable 1 µl chambers. Fifteen experienced technicians from 5 hospitals (3 per hospital) each performed 6 manual counts of 10 different native urine samples using a manual chamber and standard methods. The sEC counts were at least 50/µL, and the coefficient of variation (CV) was less than 14%; the RBC and WBC counts were at least 200/µL and the CVs were less than 7%. The same samples were also analyzed 6 times using automated analyzers. The means, CVs, and biases were determined. The median CVs for the manual measurements were 6.4% (WBCs), 6.6% (RBCs), and 12.7% (sECs). The CVs of the automated analyzer were 4.7% (WBCs), 5.6% (RBCs), and 9.2% (sECs). Biases between the automated and manual methods were −2.9% to 5.0%(WBCs), −0.8% to 8.8% (RBCs) and −2.8% to 9.4% (sECs). The count mean values and expanded uncertainties of these counts were (224.5 ± 15.0) cells/µL, (234.2 ± 16.2) cells/µL, and (61.5 ± 7.9) cells/µL, respectively. The standardized manual method for measuring UFEs had high precision and accuracy, making it a suitable reference method. Use of this reference method to calibrate an automated analyzer improved the accuracy of automated analysis.



中文翻译:

建立测量尿液形成元素的参考程序并评估自动尿液分析仪。

需要一种标准化的参考方法来精确准确地测量尿液形成的元素(UFE,红细胞[RBC],白细胞[WBC]和鳞状上皮细胞[sEC])。我们将标准方法的结果与自动分析仪的结果进行了比较。受过训练的技术人员使用标准的明场显微镜检查新鲜的未离心尿液样品,并使用1 µl一次性处理室。来自5家医院(每家医院3家)的15名经验丰富的技术人员,每个人都使用手动室和标准方法对10种不同的天然尿液样本进行了6次手动计数。sEC计数至少为50 / µL,变异系数(CV)小于14%;RBC和WBC计数至少为200 / µL,CV小于7%。同样的样品也使用自动分析仪分析了6次。手段,简历,和偏见被确定。手动测量的中值CV为6.4%(WBC),6.6%(RBC)和12.7%(sEC)。自动分析仪的CV为4.7%(WBC),5.6%(RBC)和9.2%(sEC)。自动和手动方法之间的偏差为-2.9%至5.0%(WBC),-0.8%至8.8%(RBC)和-2.8%至9.4%(sEC)。计数平均值和这些计数的扩展不确定度分别为(224.5±15.0)个细胞/µL、(234.2±16.2)个细胞/ µL和(61.5±7.9)个细胞/ µL。用于测量UFE的标准化手动方法具有很高的精度和准确性,使其成为一种合适的参考方法。使用此参考方法校准自动分析仪可提高自动分析的准确性。自动分析仪的CV为4.7%(WBC),5.6%(RBC)和9.2%(sEC)。自动和手动方法之间的偏差为-2.9%至5.0%(WBC),-0.8%至8.8%(RBC)和-2.8%至9.4%(sEC)。计数平均值和这些计数的扩展不确定度分别为(224.5±15.0)个细胞/µL、(234.2±16.2)个细胞/ µL和(61.5±7.9)个细胞/ µL。用于测量UFE的标准化手动方法具有很高的精度和准确性,使其成为一种合适的参考方法。使用此参考方法校准自动分析仪可提高自动分析的准确性。自动分析仪的CV为4.7%(WBC),5.6%(RBC)和9.2%(sEC)。自动和手动方法之间的偏差为-2.9%至5.0%(WBC),-0.8%至8.8%(RBC)和-2.8%至9.4%(sEC)。计数平均值和这些计数的扩展不确定度分别为(224.5±15.0)个细胞/µL、(234.2±16.2)个细胞/ µL和(61.5±7.9)个细胞/ µL。测量UFE的标准手动方法具有很高的精度和准确性,使其成为一种合适的参考方法。使用此参考方法校准自动分析仪可提高自动分析的准确性。(234.2±16.2)个细胞/ µL和(61.5±7.9)个细胞/ µL。测量UFE的标准手动方法具有很高的精度和准确性,使其成为一种合适的参考方法。使用此参考方法校准自动分析仪可提高自动分析的准确性。(234.2±16.2)个细胞/ µL和(61.5±7.9)个细胞/ µL。测量UFE的标准手动方法具有很高的精度和准确性,使其成为一种合适的参考方法。使用此参考方法校准自动分析仪可提高自动分析的准确性。

更新日期:2019-10-30
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