Performance Evaluation of Clinical Detection of Coagulation Factors, Protein S, Protein C, Anti-thrombin Ⅲ, and von Willebrand Factor Antigen

  Objective  To conduct a comprehensive performance evaluation of fully automated coagulation analyzer in testing coagulation factors, protein S(PS), protein C(PC), anti-thrombin Ⅲ (AT-Ⅲ), and von Willebrand factor antigen (vWF:Ag).

  Methods  According to the Clinical and Laboratory Standards Institute (CLSI) EP5-A2, EP9-A2, and WS/T 406-2012 specifications, coagulation factors(FⅡ, FⅤ, FⅦ, FⅧ, FⅨ, FⅩ, FⅪ, and FⅫ), PS, PC, AT-Ⅲ, and vWF:Ag were detected in the apparatus to evaluate the accuracy, within-run and between-run imprecisions, linear range, carryover rate, method comparisons, and reference range of the ACL TOP 700 coagulation analyzer.

  Results  The instrument had high accuracy and precision, a good linear range, and low carryover rate (0-2.63%, < 3%). The biases of the 12 College of American Pathologists (CAP) controls compared with the target value were all less than 15%, excepting the low value of PC. The within-run imprecisions of 8 coagulation factors were 1.7%-4.4%, and the between-run imprecisions were 2.2%-7.5%. The within-run imprecisions of 3 thrombophilia screen tests and vWF:Ag were 1.0%-7.0% and 2.2%-3.1%, and he between-run imprecisions were 1.5%-10.5% and 2.1%-4.1%, respectively. The carryover rates of the 12 items ranged from 0 to 2.63%. Results of liner verification test showed the correlation coefficients of PS, PC, AT-Ⅲ, and vWF:Ag were 0.982-0.988. Results of method comprisons showed the correlation coefficients of ACL TOP 700 and other coagulation analyzer were more than 0.975, and the recommended reference ranges of all the 12 items were appropriate for our laboratory.

  Conclusions  ACL TOP 700 coagulation analyzer has a good performance in accuracy, imprecision, carryover rate, linear range, and method comparison. It is suitable for detection of clinical specimens.