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KMID : 1101220000320030309
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2000 Volume.32 No. 3 p.309 ~ p.314
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A Study of Systematic Error Through Quality Control Material During One Year
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Chang Sang-Wu
Kim Dae-Sik
Sur Han-Ik
Chang Sun-Mo
Yeo Young-Gyu
Kim Yang-Ho
Cho Young-Ju
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Abstract
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Bias is an effect tending to produce results that depart systematically from the true value. Bias called systematic error in total quality management field. Systematic Error is an error that always in one direction and is predictable, in contract to random errors that may be either be either positive or negative and whose direction can not be predicted. We studied systematic error in using same quality control material during one year in clinical chemistry laboratory in order to evaluate bias from target value with Hitachi 7150 system. Grand means of systematic error were total protein(normal control-0.08, abnormal control-0.05), albumin(N-0.06, AB-0.04) , total bilirubin(N-0.13, AB-0.22), alkaline phosphatase (N-13.6, AB-56.8), glucose(N-2.75, AB-11.63), AST(N-1.3, AB-2.8), ALT(N-2.72, AB-7.35), BUN(N-0.27, AB-1.5), uric acid(N-0.2, AB-0.3), calcium(N-0.26,AB-0.29), inorganic phosphorus (N-0.19, AB-0.47), gama-GTP(N-0.83, AB-2.5), creatinine(N-0.17, AB-0.07), direct bilirubin (N-0.01, AB-0.07), CK(N-4.1, AB-14.2), LD(N-46.3, AB-73.65), total cholesterol(N-4.6, AB-3.1), triglyceride(N-4.7， AB-7.5).
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KEYWORD
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Bias, Systematic error, Quality control material, Total quality management
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