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장상우 ( Sang Wu Chang ),서한익 ( Han Ik Sur ),김대식 ( Dae Sik Kim ),김양호 ( Yang Ho Kim ),김영활 ( Young Hwal Kim ),여영규 ( Young Gyu Yeo ),장순모 ( Soon Mo Chang ),민재기 ( Jae Gi Min ),조영주 ( Young Ju Cho ) 대한임상검사과학회 1999 대한임상검사과학회지(KJCLS) Vol.31 No.2
Pareto ana1ysis through qua1ity improvement activities is the study of related subjects to determine if one is more significant than the others and used to identify the most important item in group of items. The Pareto chart breaks down an item into its component parts and then arranges and displays those parts in order of importance. Pareto ana1ysis is used to focus problem-solving activities, so that the area causing the most difficulty is addressed first. We eva1uated error problems in c1inica1 chemistry laboratory from J anuary 1997 to December 1998. We used systems thinking for cause and effect diagram for problem-solving and Pareto analysis to solve the problem factors of ana1ytica1 performance of Hitachi 7150 system for two years. We found that tota1 problems reduced 33.5 percentage during one year after educating system thinking, cause and effect analysis. We conc1uded that 8 1. 19 percentage of the total problems controlled by 23% of the items that are two factors. Upon examination, this 80/20 rule(Pareto distribution) proved true in our working area. We use the Pareto distribution to achive an 80% qualiη improvement by working 20% of the problem causes. We think Pareto an떠ysis is a tool for problem-solving during quality improvement activities for total quality management in medical laboratory science.
장상우 ( Sang Wu Chang ),김대식 ( Dae Sik Kim ),서한익 ( Han Ik Sur ),장순모 ( Sun Mo Chang ),여영규 ( Young Gyu Yeo ),김양호 ( Yang Ho Kim ),조영주 ( Young Ju Cho ) 대한임상검사과학회 2000 대한임상검사과학회지(KJCLS) Vol.32 No.3
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 c1inical chemisσy 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 cα1trol-0.05), a1bm띠n(N-O.06, AB-O.04) , total bi1irubin(N-O.13, AB-O.22), a1ka1ine phosphatase (N-13.6, AB-56.8), glucose(N-2.75, AB-l 1.63), AST(N-1.3, AB-2.8), ALT(N-2.72, AB-7.35), BUN(N-O.27, AB-1.5), uric acid(N-O.2, AB-O.3) , calcium(N-O. 26,AB-O. 29) , inorganic phosphorus (N-O.19, AB-0.47), gama-GTP(N-O.83, AB-2.5), creatinine(N-O.l7, AB-O.07), direct bi1irubin (N-O.Ol, AB-O.07), CK(N-4.l, AB-14.2), LD(N-46.3, AB-73.65), total cholesterol(N-4.6, AB-3.1), πiglyceride(N-4.7, AB-7.5).