Multi-center validation of the Response Biomedical Corporation RAMP® NT-proBNP assay with comparison to the Roche Diagnostics GmbH Elecsys® proBNP assay

Elizabeth Lee-Lewandrowski, James L. Januzzi, Sandy M. Green, Bakhos Tannous, Alan H.B. Wu, Andrew Smith, Alicia Wong, Mary Ann M. Murakami, Jason Kaczmarek, Fred S. Apple, Wayne L. Miller, Karen Hartman, Allan S. Jaffe

Research output: Contribution to journalArticlepeer-review

18 Scopus citations


Background: NT-proBNP measurements aid in the evaluation of patients with suspected heart failure (HF) and may facilitate risk stratification in patients with HF and acute coronary syndrome (ACS). Point-of-care (POC) assays may provide more timely results and potentially improve patient outcomes. Methods: We evaluated the analytical performance of the Response Biomedical Corporation whole blood RAMP amino-terminal pro-B type natriuretic peptide (NT-proBNP) POC assay compared to the Roche Elecsys proBNP (NT-proBNP) assay. Results: Intra-day and total imprecision (% CV) ranged from 5.5% to 10.3% at 140, 449 and 1675 ng/L. The lowest concentration that yields a 20% CV was 57 ng/L. The lower limit of detection was 18 ng/L. The upper limit of linearity was validated to 23,428 ng/L with an average recovery of 95%. Correlation by Passing and Bablok regression yielded RAMP = 1.01 Elecsys + 14.6, r = 0.98 (n = 540; range of Elecsys values < 5 to > 35,000). Concordance of RAMP versus Elecsys using cut-offs of 125 ng/L for subjects < 75 years and 450 ng/L for subjects ≥ 75 was 92% (95% CI 89-94%) for a group consisting of 127 apparently healthy individuals and 208 non-healthy subjects without HF, and 99% (95% CI 97-100%) for patients with HF, using the New York Heart Association (NYHA) functional classification. Overall, 80%, 87%, 97% and 100% of the RAMP results and 77%, 85%, 96% and 100% of the Elecsys results were greater than the age appropriate cut-off for NYHA I, II, III or IV groups. For both the RAMP and Elecsys results, the median NT-proBNP value was statistically correlated (increasing) with NYHA I, II, III or IV groups, respectively (p < 0.0001), with no significant difference between the two methods. Conclusions: The POC Response Biomedical RAMP NT-proBNP assay provides comparable results that measured on the FDA cleared Roche Elecsys central laboratory platform.

Original languageEnglish (US)
Pages (from-to)20-24
Number of pages5
JournalClinica Chimica Acta
Issue number1-2
StatePublished - Nov 2007


  • Biomedical
  • Heart failure
  • Method validation
  • NT-proBNP
  • Point-of-care
  • RAMP®

ASJC Scopus subject areas

  • Biochemistry
  • Clinical Biochemistry
  • Biochemistry, medical


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