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Clin Biochem. 2014 Nov;47(16-17):203-10. doi: 10.1016/j.clinbiochem.2014.07.015. Epub 2014 Jul 28.

NMR measurement of LDL particle number using the Vantera Clinical Analyzer.

Author information

1
LipoScience Inc., Raleigh, NC, USA. Electronic address: steven.matyus@liposcience.com.
2
LipoScience Inc., Raleigh, NC, USA.

Abstract

BACKGROUND:

The Vantera Clinical Analyzer was developed to enable fully-automated, high-throughput nuclear magnetic resonance (NMR) spectroscopy measurements in a clinical laboratory setting. NMR-measured low-density lipoprotein particle number (LDL-P) has been shown to be more strongly associated with cardiovascular disease outcomes than LDL cholesterol (LDL-C) in individuals for whom these alternate measures of LDL are discordant.

OBJECTIVE:

The aim of this study was to assess the analytical performance of the LDL-P assay on the Vantera Clinical Analyzer as per Clinical Laboratory Standards Institute (CLSI) guidelines.

RESULTS:

Sensitivity and linearity were established within the range of 300-3500 nmol/L. For serum pools containing low, medium and high levels of LDL-P, the inter-assay, intra-assay precision and repeatability gave coefficients of variation (CVs) between 2.6 and 5.8%. The reference interval was determined to be 457-2282 nmol/L and the assay was compatible with multiple specimen collection tubes. Of 30 substances tested, only 2 exhibited the potential for assay interference. Moreover, the LDL-P results from samples run on two NMR platforms, Vantera Clinical Analyzer and NMR Profiler, showed excellent correlation (R(2)=0.96).

CONCLUSIONS:

The performance characteristics suggest that the LDL-P assay is suitable for routine testing in the clinical laboratory on the Vantera Clinical Analyzer, the first automated NMR platform that supports NMR-based clinical assays.

KEYWORDS:

CV risk management; Cardiovascular disease; Lipoprotein particle analysis; Low-density lipoprotein; NMR spectroscopy

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