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Items for "bias"

Critical appraisal of diagnostic studies in nuclear medicine

The conceptual ideas of evidence based critical appraisal of diagnostic studies are described in this survey...

Keywords: Evidenzbasierte Medizin, Diagnosestudien, Wahrscheinlichkeitsverhältnis, Bias, STARD-Initiative

01/2003 | Nuklearmedizin, Schattauer

Quality of serum creatinine measurement in light of EQA programs

Background: The aim of our study was to identify the role of External Quality Assessment (EQA) programs in improving the quality of serum creatinine measurement and glomerular filtration rate (GFR) estimation...

Keywords: bias, creatinine, External Quality Assessment (EQA), glomerular filtration rate, kidney

05/2007 | Clinical Chemical Laboratory Medicine, Walter de Gruyter

Effects of analytic variations in creatinine measurements on the classification of renal disease using estimated glomerular filtration rate (eGFR)

Background: This study uses the Isotope Dilution Mass Spectrometer-Traceable Modification of Diet in Renal Disease (MDRD) equation to evaluate the effects of analytic variation of serum creatinine on estimated glomerular filtration rate (eGFR)...

Keywords: bias, creatinine, estimated GFR (eGFR), glomerular filtration (GFR), Guidelines

06/2007 | Clinical Chemical Laboratory Medicine, Walter de Gruyter

An Empirical Study on the Accuracy of Ratio and Regression Estimators in the Presence of Measurement Errors

When the survey data are equipped with measurement errors, the essential properties of the estimates are adversely affected...

Keywords: Auxiliary variable, bias, mean square error, measurement error, simple random sampling

11/2006 | Monte Carlo Methods and Applications, Walter de Gruyter

Quality assessment of quantitative analytical results in laboratory medicine by root mean square of measurement deviation

The current Guidelines of the German Medical Association (“Richtlinien der Bundesärztekammer”, RiLiBÄK) define minimum requirements for the quality assessment of quantitative measurements in laboratory medicine, in particular concerning metrological controls...

Keywords: analytische Messungen, messtechnische Kontrolle, Messunsicherheit, Qualitätskontrolle, systematische Messabweichung, Vergleichbarkeit, Wiederholpräzision

07/2006 | LaboratoriumsMedizin, Walter de Gruyter

Trueness verification of actual creatinine assays in the European market demonstrates a disappointing variability that needs substantial improvement. An international study in the framework of the EC4 creatinine standardization working group

Background: The European In Vitro Diagnostics (IVD) directive requires traceability to reference methods and materials of analytes...

Keywords: analytical error, bias, calibration, creatinine, External Quality Assessment, glomerular filtration rate, reference methods

09/2008 | Clinical Chemical Laboratory Medicine, Walter de Gruyter

Accuracy in clinical chemistry – who will kiss Sleeping Beauty awake?

Triggered by recent criticism from parties outside the clinical chemistry community on poor analytical accuracy of measurement procedures used for evaluating the calcium-parathyroid hormone-vitamin D axis, I argue, in this opinion paper, strongly in favor of prioritizing the establishment of accuracy...

Keywords: analytical quality, bias, standardization