title: Z transformation is the gold standard for computing the sigma metric.
authors.affiliation: Acibadem University, School of Medicine, Department of Medical Biochemistry, Istanbul, Turkey. Electronic address: Coskun2002@gmail.com.
authors.forename: Abdurrahman
authors.initials: A
authors.lastname: Coskun
authors.affiliation: Acibadem University, School of Medicine, Department of Medical Biochemistry, Istanbul, Turkey.
authors.forename: Mustafa
authors.initials: M
authors.lastname: Serteser
authors.affiliation: Acibadem University, School of Medicine, Department of Medical Biochemistry, Istanbul, Turkey.
authors.forename: Muhittin
authors.initials: M
authors.lastname: Serdar
authors.affiliation: Acibadem University, School of Medicine, Department of Medical Biochemistry, Istanbul, Turkey.
authors.forename: Fehime
authors.initials: F
authors.lastname: Aksungar
authors.affiliation: Acibadem University, School of Medicine, Department of Medical Biochemistry, Istanbul, Turkey.
authors.forename: Meltem
authors.initials: M
authors.lastname: Kilercik
authors.affiliation: Acibadem University, School of Medicine, Department of Medical Biochemistry, Istanbul, Turkey.
authors.forename: Ibrahim
authors.initials: I
authors.lastname: Unsal
mesh_terms: D000465:Algorithms; D002984:Clinical Laboratory Information Systems / Q000592:standards*; D003198:Computer Simulation; D006801:Humans; D019300:Medical Errors / Q000517:prevention & control*; D058996:Quality Improvement; D017749:Total Quality Management
keywords: Defects per million opportunities (DPMO); Laboratory errors; Sigma metric; Six sigma; Z transformation