OBJECTIVETo evaluate the difference of 2 operation modes for patient plasma coagulation test and its intra-batch precision by using SysmexCA-7000.

METHODSThe SysmexCA-7000 blood coagulometer with agents, the normal and micro operation modes were respectively used to determine the prothrombin time (PT), fibringen (Fib), activated patial thromboplastine time (APTT) and thrombin time (TT) in 10 mixtures of multiple plasma samples, quality-control samples and 50 patient plasma samples, Among them, the 10 mixed samples and 2 quality-control plasma samples were tested for 10 times by every mode. The average level (̄X) of PT, Fib, APTT and TT, standard deviation (S) and intra-batch precision (coefficient of variation CV%) were respectively calculated. The intra-batch precision and coagulation results under 2 mode operations were analyzed statistically.

RESULTSThere was significantly statistical difference (P < 0.001) for intra-batch CVs between 2 mode for APTT, Fib, PT and TT with a level of 0.53%-1.58%, 0.72%-2.08%, 0.51%-1.37%, 0.58%-1.60% and Normal mode with 1.17%-2.10%, 1.10%-2.43%, 0.88%-1.99%, 1.05%-1.98%, respectively. APTT, PT and Fib of 50 patient plasma samples under micro mode operations were statistically different from normal mode, but TT was not different between 2 modes.

CONCLUSIONThe micro mode detection is more accurate and precise than that of normal mode by using SysmexCA-7000 blood coagulometer.