Analytical Performance of the Sixth Generation High-Sensitivity Cardiac Troponin T Assay

Area of Science:

• Clinical Chemistry
• Biomarker Analysis
• Diagnostic Assays

Background:

• High-sensitivity cardiac troponin assays are crucial for diagnosing myocardial infarction.
• The Roche Elecsys® Troponin T high-sensitivity Gen 5 assay (Gen 5) is the current standard, cleared in 2017.
• A new sixth-generation assay (Gen 6) has been developed with enhanced analytical performance.

Purpose of the Study:

• To evaluate the analytical performance of the new Elecsys® Troponin T high-sensitivity Gen 6 (Gen 6) assay in a clinical laboratory setting.
• To compare the analytical characteristics of Gen 6 with the existing Gen 5 assay.
• To assess the sensitivity, precision, and interference resistance of the Gen 6 assay.

Main Methods:

• Evaluation of the Gen 6 assay on Roche cobas e 801 analyzers.
• Determination of measurement limits (limit of blank, limit of detection, limit of quantitation) per CLSI EP17-A2.
• Assessment of repeatability and intermediate precision using QC materials and plasma specimens per CLSI EP05-A2 and EP15-A2.

Main Results:

• Gen 6 demonstrated a positive bias versus Gen 5 at concentrations >10 ng/L, with reversed bias below this threshold.
• The limit of blank was 0.4 ng/L, limit of detection was 1.2 ng/L, and limit of quantitation was 2.2 ng/L (10% CV).
• No cross-reactivity was observed for other troponin variants, and hemolysis interference was negligible up to 5000 mg/dL hemoglobin.

Conclusions:

• The Gen 6 assay exhibits superior analytical sensitivity with lower limits of detection and quantitation compared to Gen 5.
• The assay shows robust resistance to common interferences, including hemolysis and other troponin isoforms.
• These improvements enable broader coverage for detecting cardiac troponin T, particularly in healthy individuals.