A novel approach for more precise quantification of M-protein using variables derived from immunosubtraction electropherogram and associated biochemistry analytes.

IF 3.8 3区 医学 Q1 MEDICAL LABORATORY TECHNOLOGY
Dragana Šegulja, Danica Matišić, Karmela Barišić, Dunja Rogić
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引用次数: 0

Abstract

Introduction: Due to limitations in currently used methodologies, the widely acknowledged approach for quantifying M-protein (MP) is not available. If employed as a source of quantitative data, the immunosubtraction electropherogram (IS-EPG), a qualitative analysis of MP, has the potential to overcome known analytical issues. The aim of this study is to explore measured and derived variables obtained from immunosubtraction electropherogram as a tool for quantifying MP and to compare the derived results to currently available methods.

Materials and methods: Measurands were amplitudes of MP and albumin fractions. Assessed derived variables included also immunoglobulin (Ig) G, IgA, IgM and total protein data. Capillary electrophoresis was used for determination of MP (in % of total protein concentration, or concentration of MP in g/L) by perpendicular drop and tangent skimming method.

Results: Passing-Bablok analysis showed the most comparable results in D1Ig and D1nIg variables, and the largest discrepancies in AD1nIg and AD2nIg variables. The background presence had greater impact on D1nIg comparison results than did on D1Ig results. The contribution of albumin fraction data did not improve the comparability of the results. The coefficients of variation of derived variables were lower (maximum 3.1%) than those obtained by densitometric measurements, regardless of MP concentration, polyclonal background, or migration pattern (2.3-37.7%).

Conclusion: The amplitude of MP spike in IS-EPG is an valuable measurand to compute derived variables for quantifying MP. The most comparable results were achieved with the D1Ig variable. Patients with monoclonal gammopathy can benefit from increased precision employing an objective and background independent measurand, especially during longitudinal follow-up.

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一种新的方法,更精确地定量m蛋白使用变量从免疫减去电泳和相关的生化分析。
由于目前使用的方法的局限性,广泛认可的定量m蛋白(MP)的方法是不可用的。如果用作定量数据的来源,免疫减法电泳(IS-EPG), MP的定性分析,有可能克服已知的分析问题。本研究的目的是探索从免疫减影电泳作为定量MP的工具获得的测量和衍生变量,并将衍生结果与目前可用的方法进行比较。材料和方法:测定MP和白蛋白组分的振幅。评估的衍生变量还包括免疫球蛋白(Ig) G、IgA、IgM和总蛋白数据。毛细管电泳(以总蛋白浓度%计,或以g/L计)采用垂直滴法和切线脱脂法测定。结果:passingbablok分析显示,D1Ig和D1nIg变量的结果最具可比性,而AD1nIg和AD2nIg变量的差异最大。背景存在对D1Ig比较结果的影响大于对D1Ig结果的影响。白蛋白分数数据的贡献并没有提高结果的可比性。无论MP浓度、多克隆背景或迁移模式如何,衍生变量的变异系数(最大3.1%)都低于密度测定法(2.3-37.7%)。结论:is - epg中MP峰幅值是定量计算MP衍生变量的一个有价值的指标。最具可比性的结果是用D1Ig变量获得的。单克隆伽玛病患者可以受益于使用客观和背景独立的测量提高精度,特别是在纵向随访期间。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Biochemia Medica
Biochemia Medica 医学-医学实验技术
CiteScore
5.50
自引率
3.00%
发文量
70
审稿时长
>12 weeks
期刊介绍: Biochemia Medica is the official peer-reviewed journal of the Croatian Society of Medical Biochemistry and Laboratory Medicine. Journal provides a wide coverage of research in all aspects of clinical chemistry and laboratory medicine. Following categories fit into the scope of the Journal: general clinical chemistry, haematology and haemostasis, molecular diagnostics and endocrinology. Development, validation and verification of analytical techniques and methods applicable to clinical chemistry and laboratory medicine are welcome as well as studies dealing with laboratory organization, automation and quality control. Journal publishes on a regular basis educative preanalytical case reports (Preanalytical mysteries), articles dealing with applied biostatistics (Lessons in biostatistics) and research integrity (Research integrity corner).
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