Systematic Comprehensive Evaluation of the Mindray CX-9000 Coagulation Analyzer Performance

The aim of the study was to conduct a comprehensive performance evaluation of the Mindray CX-9000 fully automated coagulation analyzer for the detection of the seven coagulation items.The performance of activated partial thromboplastin time (APTT), prothrombin time (PT), fibrinogen (FIB), thrombin time (TT), D-dimer (D-D), fibrinogen degradation product (FDP), and antithrombin Ⅲ (AT) was validated for precision, linear range, carryover contamination rate, reference interval validation, inter-method agreement, and anti-interference ability.The intra- and inter-precision (coefficient of variation, CV%) of all seven items was less than the target CV%; the carryover contamination rates for different concentrations and between items were < 10%. The slope of the linear regression equation for the theoretical and measured values of the linear range was within 1 ± 0.05 and R ≥ 0.975. The reference interval quoted from the manufacturer's reference interval passed ≥ 95%. The CX-9000 was compared with the results of the reference instrument STAGO R MAX (STA-R MAX) and the p-values for all items ranged from 0.822 to 0.987. Within the concentration range claimed by the manufacturer, the interference errors produced by all items met the manufacturer's claimed criteria, except for triglycerides which produced interference errors > 10% for the FIB, D-D, FDP, and bilirubin which produced interference errors for the FIB and D-D assays.The CX-9000 automatic coagulation analyzer has good stability and repeatability, a wide linear range of detection, low carryover contamination rate, and high resistance to interference, making it suitable for the testing of clinical specimens.