• Magdalena Krintus, Marek Kozinski, Pascal Boudry, Nuria Estañ Capell, Ursula Köller, Karl Lackner, Guillaume Lefèvre, Lieselotte Lennartz, Johannes Lotz, Antonio Mora Herranz, Mads Nybo, Mario Plebani, Maria B Sandberg, Wolfgang Schratzberger, Jessie Shih, Øyvind Skadberg, Ahmed Taoufik Chargui, Martina Zaninotto, and Grazyna Sypniewska.
• Clin Chem Lab Med. 2014 Nov 1; 52 (11): 1657-65.

BackgroundInternational recommendations highlight the superior value of cardiac troponins (cTns) for early diagnosis of myocardial infarction along with analytical requirements of improved precision and detectability. In this multicenter study, we investigated the analytical performance of a new high sensitive cardiac troponin I (hs-cTnI) assay and its 99th percentile upper reference limit (URL).MethodsLaboratories from nine European countries evaluated the ARCHITECT STAT high sensitive troponin I (hs-TnI) immunoassay on the ARCHITECT i2000SR/i1000SR immunoanalyzers. Imprecision, limit of blank (LoB), limit of detection (LoD), limit of quantitation (LoQ) linearity of dilution, interferences, sample type, method comparisons, and 99th percentile URLs were evaluated in this study.ResultsTotal imprecision of 3.3%-8.9%, 2.0%-3.5% and 1.5%-5.2% was determined for the low, medium and high controls, respectively. The lowest cTnI concentration corresponding to a total CV of 10% was 5.6 ng/L. Common interferences, sample dilution and carryover did not affect the hs-cTnI results. Slight, but statistically significant, differences with sample type were found. Concordance between the investigated hs-cTnI assay and contemporary cTnI assay at 99th percentile cut-off was found to be 95%. TnI was detectable in 75% and 57% of the apparently healthy population using the lower (1.1 ng/L) and upper (1.9 ng/L) limit of the LoD range provided by the ARCHITECT STAT hs-TnI package insert, respectively. The 99th percentile values were gender dependent.ConclusionsThe new ARCHITECT STAT hs-TnI assay with improved analytical features meets the criteria of high sensitive Tn test and will be a valuable diagnostic tool.

19 keywords...

hide…