Multicenter evaluation of Reflotron® direct dry-chemistry assay of high- density lipoprotein cholesterol in venous and fingerstick specimens

G. R. Warnick, G. J.M. Boerma, G. Assmann, A. T. Endler, G. Gerique, A. M. Gotto, M. S. Graziani, U. Lippi, W. Patsch, W. F. Riesen, E. T. Leary, G. Hiller, R. Zerback, R. Leinberger

Research output: Contribution to journalArticle

11 Scopus citations

Abstract

The Reflotron® HDL Cholesterol test (Boehringer Mannheim GmbH) directly separates and analyzes high-density lipoprotein (HDL) cholesterol in plasma collected with EDTA in an integrated dry-reagent system suitable for alternative site testing of lipoproteins. We describe a multicenter evaluation of this test by two US and six European laboratories experienced in lipid analysis. Each laboratory compared the Reflotron with the same conventional wet-chemistry method, Boehringer phosphotungstate-Mg2+ precipitation with enzymatic cholesterol assay. Imprecision was within accepted guidelines, with CVs of ≤8% for fresh and frozen plasmas (median CV 1.7-3.9%) and for lyophilized sera (median CV 3.8-4.7%), similar to those of the conventional method. Results of linear-regression analysis were as follows: Reflotron HDL Cholesterol = 1.03 conventional - 3.9 mg/L, r = 0.987. The Reflotron results were somewhat low in the two US laboratories, demonstrating the need for general standardization of methods for measuring HDL cholesterol. Results from capillary fingerstick plasma agreed well with those from venous-derived plasma: capillary = 1.04 venous + 4.5 mg/L, r = 0.967. The system is relatively insensitive to interference from hemoglobin (≤0.75 g/L), ascorbic acid (≤0.3 g/L), bilirubin (≤50 mg/L), cholesterol (≤3.5 g/L), and triglycerides (≤4 g/L). The relative ease of operation and the rapid availability of results (within 90 s for plasma collected in EDTA) make the method appropriate for use by well-trained, but not necessarily technical, operators in the physician's office or other alternative sites.

Original languageEnglish (US)
Pages (from-to)271-277
Number of pages7
JournalClinical Chemistry
Volume39
Issue number2
DOIs
StatePublished - 1993

Keywords

  • Enzymatic methods
  • Physician's office testing
  • Reflectance photometry

ASJC Scopus subject areas

  • Clinical Biochemistry

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