title: [Evaluation of the analytical performance characteristics of NT-proBNP immunoassay on dimension RxL-HM (Dade Behring)].
abstract: BACKGROUND
  Plasma B-type natriuretic peptide (BNP) and N terminal prohormone (NT-proBNP) are promising markers for the diagnosis, prognosis and follow up of heart failure. Elevated levels have been associated with adverse long-term outcome in patients with acute coronary syndromes.
  
  
  METHODS
  The analytical performance of a new automated NT-proBNP assay on Dimension-HM system (Dade Behring) and comparison with the results obtained with the Roche Diagnostics NT-proBNP assays using the Elecsys instrument have been evaluated according to the Valtec protocol.
  
  
  RESULTS
  Total imprecision (CV) was below 9% for NT-proBNP concentrations between 100 and 10,000 pg/mL using quality control samples and pooled patients' plasma. Analytical sensitivity was found 9.8 pg/mL the day of calibration and 10.1 pg/mL ten days later. Dilution linearity showed overall recovery between 98.4 and 104.7%. No hook effect was observed for NT-proBNP concentration up to 96,000 pg/mL. The interference of turbidity was below 4%. Hemoglobin interfered negatively with assay upper 240 micromol/L but less than 10%. A precision profile demonstrated a total imprecision of 10% CV at a NT-proBNP concentration of 70 pg/mL and 20% at 30 pg/mL. Dimension results highly correlated (r = 0.99) with Roche Elecsys NT-proBNP.
authors.affiliation: Laboratoire de biochimie, Hôpital européen Georges Pompidou, Paris. marie-odile.benoit@egp.aphp.fr
authors.forename: M-O
authors.initials: MO
authors.lastname: Benoit
authors.forename: F
authors.initials: F
authors.lastname: Dautezac
authors.forename: M
authors.initials: M
authors.lastname: Taccoen
authors.forename: J-L
authors.initials: JL
authors.lastname: Paul
mesh_terms: D001331:Automation; D015415:Biomarkers / Q000097:blood; D006333:Heart Failure / Q000097:blood / Q000175:diagnosis; D006801:Humans; D007118:Immunoassay / Q000379:methods; D020097:Natriuretic Peptide, Brain / Q000097:blood*; D010446:Peptide Fragments / Q000097:blood*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity
chemical_list: D015415:Biomarkers; D010446:Peptide Fragments; C109794:pro-brain natriuretic peptide (1-76); D020097:Natriuretic Peptide, Brain