Performance evaluation of a new high-sensitivity cardiac troponin T assay: hs-cTnT (CLIA) assay

OBJECTIVES: The Fourth Universal Definition of Myocardial Infarction recommends high-sensitivity cardiac troponin (hs-cTn) as the preferred biomarker for diagnosing myocardial infarction. This study evaluated the analytical and clinical performance of a novel hs-cTnT chemiluminescence immunoassay (CLIA) developed by Mindray. METHODS: Analytical performance characteristics including precision, sensitivity (limit of detection [LoD] and limit of quantification [LoQ]), imprecision profile, linearity, sample type comparison, method comparison, and potential interferences were assessed. Sex-specific 99th percentile upper reference limits (URLs) were established in 895 healthy individuals. Clinical diagnostic performance was evaluated in 559 patients with suspected acute myocardial infarction and compared with the Roche hs-cTnT assay. RESULTS: The Mindray assay showed excellent precision (repeatability CV≤1.99 %, within-laboratory precision CV≤6.11 %), superior sensitivity (LoD: 1.4 ng/L; LoQ: 2.4 ng/L), and linearity (r=0.9978), along with robust performance against common and immunological interferences. Using the manufacturer-claimed LoD of 2.0 ng/L, measurable values were found in 99.36 % of males, 83.26 % of females, and 91.48 % overall, meeting criteria for high-sensitivity assays. The derived sex-specific 99th percentiles were 18.6 ng/L (males), 9.6 ng/L (females), and 16.0 ng/L (overall). In the clinical cohort, the assay showed 100.0 % sensitivity, 83.3 % specificity, 80.0 % PPV, 100.0 % NPV, and an AUC of 0.988, comparable to the Roche Gen 5 hs-cTnT assay. CONCLUSIONS: The Mindray hs-cTnT (CLIA) assay meets high-sensitivity assay criteria and demonstrates robust analytical and diagnostic performance, offering a reliable alternative to the Roche Gen 5 assay for clinical evaluation of myocardial injury.