Analytical performance of the Roche Elecsys TnT hs Gen 6 immunoassay.

Area of Science:

• Clinical Chemistry
• Cardiovascular Diagnostics
• Immunoassay Technology

Background:

• Acute coronary syndrome (ACS) is a major global health concern requiring rapid diagnosis.
• High-sensitivity cardiac troponin (hs-cTn) assays are crucial for identifying myocardial injury.
• Evaluating novel diagnostic tools is essential for improving patient outcomes.

Purpose of the Study:

• To assess the analytical performance of the new Roche Elecsys TnT hs Gen 6 (TNT6ST) immunoassay.
• To compare the TNT6ST assay with the previous Elecsys hs-cTnT immunoassay (TNTHSSTX).
• To evaluate the impact of hemolysis on the performance of both assays.

Main Methods:

• Assessed intra- and inter-assay imprecision, linearity, LoB, LoD, functional sensitivity, and 99th percentile URL for TNT6ST.
• Compared TNT6ST performance against TNTHSSTX.
• Investigated hemolysis interference in plasma samples for both assays.

Main Results:

• TNT6ST demonstrated excellent precision (CVs 0.8-2.4%), linearity (r=1.00), and sensitivity (LoD 1.201 ng/L, functional sensitivity 1.255 ng/L).
• The 99th percentile URL was established (overall 20.9 ng/L, males 30.5 ng/L, females 13.7 ng/L).
• TNT6ST showed strong correlation (r=0.995) with TNTHSSTX but overestimated cTnT by ~66%; it also exhibited superior robustness to hemolysis.

Conclusions:

• The Roche TNT6ST immunoassay offers superior precision, sensitivity, and hemolysis robustness compared to its predecessor.
• The assay demonstrated excellent correlation across a wide cardiac troponin T range.
• These findings support the reliability of the TNT6ST assay for routine clinical use in diagnosing myocardial injury.