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Chinese Journal of Clinical Laboratory Management(Electronic Edition) ›› 2016, Vol. 04 ›› Issue (01): 37-42. doi: 10.3877/cma.j.issn.2095-5820.2016.01.008

Special Issue:

• Quality Control • Previous Articles     Next Articles

Use the standard deviation index and coefficient of variation ratio to evaluate the consistency of different results on the application of different blood cells analyzer in the laboratory

Feng Li1, Yinfeng Wang1, Zhiyun Shi1, Lixin Wang1, Jie Cui1, Jun Wei1,()   

  1. 1. Medical experimental center, General Hospital of Ningxia Medical Univertisy, Yinchuan 750004, China
  • Received:2015-01-31 Online:2016-02-28 Published:2016-02-28
  • Contact: Jun Wei
  • About author:
    Corresponding author: Wei Jun, Email:

Abstract:

Objective

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.

Methods

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.

Results

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.

Conclusions

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.

Key words: Standard deviation index, Coefficient of variation radio, Internal quality control, Consistency

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