title: The role of the uncertainty of measurement of serum creatinine concentrations in the diagnosis of acute kidney injury.
abstract: Uncertainty of measurement is the numeric expression of the errors associated with all measurements taken in clinical laboratories. Serum creatinine concentration is the most common diagnostic marker for acute kidney injury. The goal of this study was to determine the effect of the uncertainty of measurement of serum creatinine concentrations on the diagnosis of acute kidney injury. We calculated the uncertainty of measurement of serum creatinine according to the Nordtest Guide. Retrospectively, we identified 289 patients who were evaluated for acute kidney injury. Of the total patient pool, 233 were diagnosed with acute kidney injury using the AKIN classification scheme and then were compared using statistical analysis. We determined nine probabilities of the uncertainty of measurement of serum creatinine concentrations. There was a statistically significant difference in the number of patients diagnosed with acute kidney injury when uncertainty of measurement was taken into consideration (first probability compared to the fifth p = 0.023 and first probability compared to the ninth p = 0.012). We found that the uncertainty of measurement for serum creatinine concentrations was an important factor for correctly diagnosing acute kidney injury. In addition, based on the AKIN classification scheme, minimizing the total allowable error levels for serum creatinine concentrations is necessary for the accurate diagnosis of acute kidney injury by clinicians.
authors.affiliation: a Department of Medical Biochemistry , Faculty of Medicine, Abant Izzet Baysal University , Bolu , Turkey ;
authors.forename: Buket
authors.initials: B
authors.lastname: Kin Tekce
authors.affiliation: b Department of Nephrology , Faculty of Medicine, Abant Izzet Baysal University , Bolu , Turkey ;
authors.forename: Hikmet
authors.initials: H
authors.lastname: Tekce
authors.affiliation: c Department of Internal Medicine , Faculty of Medicine, Abant Izzet Baysal University , Bolu , Turkey ;
authors.forename: Gulali
authors.initials: G
authors.lastname: Aktas
authors.affiliation: d Department of Urology , Faculty of Medicine, Abant Izzet Baysal University , Bolu , Turkey.
authors.forename: Ugur
authors.initials: U
authors.lastname: Uyeturk
mesh_terms: D058186:Acute Kidney Injury / Q000097:blood* / Q000175:diagnosis*; D000293:Adolescent; D000328:Adult; D000368:Aged; D003404:Creatinine / Q000097:blood*; D006801:Humans; D007677:Kidney Function Tests; D008875:Middle Aged; D012189:Retrospective Studies; D035501:Uncertainty; D055815:Young Adult
chemical_list: D003404:Creatinine
keywords: Acute kidney injury; marker; serum creatinine; total allowable error; uncertainty of measurement