一种基于LC-MS的指定比较方法,其性能类似于Lp (a) 参考测量程序以指导摩拉Lp (b) 标准化
Nina M Diederiks1, L Renee Ruhaak1, Fred P H T M Romijn1
1Department of Clinical Chemistry and Laboratory Medicine, Leiden University Medical Center, Postzone E2-P, Albinusdreef 2, 2333 ZA, Leiden, The Netherlands.
Clinical proteomics
|January 24, 2024
概括
一种新的指定的比较方法 (DCM) 提供了一个可靠的方法,让IVD制造商从质量测试过渡到摩尔单位测试脂蛋白 (a) (Lp).
科学领域:
- 临床化学 临床化学
- 生物标志物测量 生物标志物测量
- 分析化学 分析化学
背景情况:
- 欧洲动脉样硬化学会 (EAS) 2022年指导方针建议测量脂蛋白 (Lp) 和报告结果以摩尔单位 (apo) 而不是质量单位.
- 让IVD制造商过渡到摩尔单位需要一个可靠的参考测量程序 (RMP) 和一个合适的指定比较方法 (DCM).
- 一个符合ISO 17511:2020标准的LC-MS RMP已经建立,但很费力和耗时.
研究的目的:
- 开发和评估一种指定的比较方法 (DCM),用于在脂蛋白 (a) (Lp(a)) 中量化阿波利波蛋白 (a) (apo(a)).
- 评估DCM与已建立的基于LC-MS的参考测量程序 (RMP) 的等价性.
- 为了指导IVD制造商在从质量到摩尔单位的Lp (a) 测试套件过渡.
主要方法:
- 开发了一种基于LC-MS的半自动化DCM,它与RMP不同,使用单个酶消化步骤.
- 对DCM和RMP的分析性能进行了对比.
- 使用这两种方法对153个人体血清样本进行了量化,这些样本以可追溯本地校准器 (SRM2B) 校准.
主要成果:
- 该DCM表现出与RMP非常相似的分析性能.
- 直接方法比较显示了同等的结果,中位数回归斜率为0.997和中位数偏差为-0.2nmol/L.
- DCM的中间不精确度在允许的总误差 (TEa) 范围内,CVa在90nmol/L时为10.2%.
结论:
- 开发的基于LC-MS的半自动化,更高吞吐量的DCM符合预定义的分析性能规格和允许的测量不确定性.
- 该DCM是适合作为一个更高层次的方法,以指导IVD制造商在Lp (a) 测试过渡到摩尔单位.
- 这一进步促进了准确和标准化的Lp(a) 报告,与临床建议保持一致.
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