title: [Comparison and evaluation of testing results for two different coagulation analyzers].
abstract: OBJECTIVE
  To evaluate the performance of a newly installed fully automatic coagulation analyzer and compare the consistency of its testing results with the confirmed clinical automatic coagulation analyzer at our department.
  
  
  METHODS
  Precision, linearity, carryover and accuracy of the newly installed coagulation analyzer were evaluated according to the national required standards. Then the testing results were analyzed between the newly installed and confirmed coagulation analyzers according to the EP-5 and EP-9 documents of national committee for clinical laboratory standards (NCCLS).
  
  
  RESULTS
  For the newly installed coagulation analyzer, the low, median and high values of relative intra-precision were: 0.93%, 1.32% and 1.27% for prothrombin time (PT); 1.42%, 0.84% and 1.17% for activated partial thromboplastin time (APTT); 1.82%, 3.13% and 3.19% for fibrinogen (FIB); 1.78%, 1.76% and 1.38% for thrombin time (TT) respectively. The linear regression equation of FIB actual and theoretical values was y = 1.012x + 0.0219 (P > 0.05). There was no significant statistical difference between the intercept and 0 (t = 0.2287, P > 0.05) and between linear slope and 1 (t = 0.3221, P > 0.05). The carryover was -2.33%. The testing results of defined acceptable bias of PT and FIB in CLIA'88 for two analyzers were within the acceptable 95% confidence interval of bias.
  
  
  CONCLUSIONS
  The precision, linearity, carryover and accuracy of the newly installed coagulation analyzer meet the requirements of instrument user manual. The performance and the testing results of the same sample from two coagulation analyzers are consistent.
authors: Department of Clinical Laboratory, Beijing Shijitan Hospital, Beijing 100038, China.
authors: Jun-lin
authors: JL
authors: Hou
authors: Xu-hong
authors: XH
authors: Zhao
authors: Man
authors: M
authors: Zhang