Article (Scientific journals)
Calibration and precision of serum creatinine and plasma cystatin C measurement: impact on the estimation of glomerular filtration rate
DELANAYE, Pierre; CAVALIER, Etienne; Cristol, Jean-Paul et al.
2014In Journal of Nephrology, 27 (5), p. 467-75
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Keywords :
Calibration; creatinine; Cystatin C; Glomerular filtration rate
Abstract :
[en] Serum creatinine (SCr) is the main variable for estimating glomerular filtration rate (GFR). Due to interassay differences, the prevalence of chronic kidney disease (CKD) varies according to the assay used, and calibration standardization is necessary. For SCr, isotope dilution mass spectrometry (IDMS) is the gold standard. Systematic differences are observed between Jaffe and enzymatic methods. Manufacturers subtract 0.30 mg/dl from Jaffe results to match enzymatic results (‘compensated Jaffe method’). The analytical performance of enzymatic methods is superior to that of Jaffe methods. In the original Modification of Diet in Renal Disease (MDRD) equation, SCr was measured by a Jaffe Beckman assay, which was later recalibrated. A limitation of this equation was an underestimation of GFR in the high range. The Chronic Kidney Disease Epidemiology (CKD-EPI) consortium proposed an equation using calibrated and IDMS traceable SCr. The gain in performance was due to improving the bias whereas the precision was comparable. The CKD-EPI equation performs better at high GFR levels (GFR[60 ml/ min/1.73 m2). Analytical limitations have led to the recommendation to give a grade ([60 ml/min/1.73 m2) rather than an absolute value with the MDRD equation. By using both enzymatic and calibrated methods, this cutoff-grade could be increased to 90 ml/min/1.73 m2 (with MDRD) and 120 ml/min/1.73 m2 (with CKD-EPI). The superiority of the CKD-EPI equation over MDRD is analytical, but the precision gain is limited. IDMS traceable enzymatic methods have been used in the development of the Lund– Malmo¨ (in CKD populations) and Berlin Initiative Study equations (in the elderly). The analytical errors for cystatin C are grossly comparable to issues found with SCr. Standardization is available since 2011. A reference method for cystatin C is still lacking. Equations based on standardized cystatin C or cystatin C and creatinine have been proposed. The better performance of these equations (especially the combined CKD-EPI equation) has been demonstrated.
Disciplines :
Laboratory medicine & medical technology
Urology & nephrology
Author, co-author :
DELANAYE, Pierre  ;  Centre Hospitalier Universitaire de Liège - CHU > Néphrologie
CAVALIER, Etienne  ;  Centre Hospitalier Universitaire de Liège - CHU > Chimie médicale
Cristol, Jean-Paul
Delanghe, Joris
Language :
English
Title :
Calibration and precision of serum creatinine and plasma cystatin C measurement: impact on the estimation of glomerular filtration rate
Publication date :
October 2014
Journal title :
Journal of Nephrology
ISSN :
1121-8428
eISSN :
1724-6059
Publisher :
Wichtig Editore, Milano, Italy
Volume :
27
Issue :
5
Pages :
467-75
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 14 April 2014

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