To analyse the comparison result of internal quality control of WBC, RBC, hemoglobin (Hb), hematocrit (HCT) and platelet (PLT) which were detected by different blood cell analyzers, and to evaluate the consistency of the results between different instruments within the same laboratory by standard deviation index (SDI) and coefficient of variation ratio (CVR), at the same time to provide a more accurate and reliable test results for clinicl.

By analyzing quality control data of the tests of WBC, RBC, Hb, HCT and PLT with five blood cell analyzers to calculate the coefficient of variation (CV), SDI and the CVR from May 1, 2014 to 31, each item has three levels level1 to 3 from Medical Experimental center, General Hospital of Ningxia Medical Univertisy.

The SDI and CVR index of the WBC, RBC, Hb, HCT and PLT were -1.37-1.84 and 0.72-1.46, -3.35-2.59 and 0.83-1.21, -3.28-3.57 and 0.40-1.67, -2.79-1.88 and 0.53-1.61, -1.25-1.21 and 0.52-1.59. The data were callected by analyzing 465 numbers totally from the five blood cell analyzers from May 1 to 31, 2014. The highest number of SDI>2 were RBC and HGB, which were 5 and 7, respectively. There was only one that was SDI>2 in HCT, and two that was SDI<2 in WBC and PLT. The unqualified rates of WBC, RBC, HGB, HCT and PLT were 0, 33.33%, 46.67%, 6.67% and 0. The CVR of five items in each instrument compared to all laboratory instruments were less than 2.

It is beneficial to carry on quality control of consistency and comparability of the results in the same test with different systems by using SDI and CVR index for accuracy and precision of laboratory evaluation, and it has good application results of laboratory quality assurance. The SDI and CVR can be used to a new model of internal quality control about the same item to test in different blood cell analyzers.