Comparison of the Target Values Established Using a Robust Statistical Method and Roche's Calibration Values.
BACKGROUND
In EQA schemes, results are usually assessed against a target value.


METHODS
Outliers in each result were deleted using a robust statistical method. Mean was used as a target value if trimmed results were normally distributed; otherwise, median was used. Differences between target value and Roche's calibration value were calculated. Rates of acceptable performance evaluated by target value and Roche's calibration value were determined.


RESULTS
Target values of P, GLU, urea, UA, TP, ALB, TC, TG, ALT, AST, ALP, AMY, LDH, GGT, FE, and HBDH were 1.70 mmol/L, 11.0 mmol/L, 16.8 mmol/L, 307 μmol/L, 54.0 g/L, 38.1 g/L, 4.19 mmol/L, 1.46 mmol/L, 97.7 U/L, 98.2 U/L, 206 U/L, 180 U/L, 242 U/L, 115 U/L, 35.6 μmol/L, and 255 U/L, respectively. Differences between target values and Roche's calibration values were -3.45 to 1.48%. Rates of acceptable performance evaluated by target values and Roche's calibration values were 96.5 - 100.0% and 93.0 - 100.0%, respectively.


CONCLUSIONS
Target values established using a robust statistical method and Roche's calibration values were comparable.
Qi
Q
Zhou
Tianjiao
T
Zhang
Simei
S
Ren
Xiaopeng
X
Li
Jihong
J
Hu
Shaonan
S
Li
Zhenxiang
Z
Gao
D002138:Calibration; D006801:Humans; D007753:Laboratories / Q000592:standards*; D011786:Quality Control; D013223:Statistics as Topic