Abstract
The Cockcroft–Gault equation for estimating glomerular filtration rate has been learnt by every generation of medical students over the decades. Since the publication of the Modification of Diet in Renal Disease (MDRD) study equation in 1999, however, the supremacy of the Cockcroft–Gault equation has been relentlessly disputed. More recently, the Chronic Kidney Disease Epidemiology (CKD-EPI) consortium has proposed a group of novel equations for estimating glomerular filtration rate (GFR). The MDRD and CKD-EPI equations were developed following a rigorous process, are expressed in a way in which they can be used with standardized biomarkers of GFR (serum creatinine and/or serum cystatin C) and have been evaluated in different populations of patients. Today, the MDRD Study equation and the CKD-EPI equation based on serum creatinine level have supplanted the Cockcroft–Gault equation. In many regards, these equations are superior to the Cockcroft–Gault equation and are now specifically recommended by international guidelines. With their generalized use, however, it has become apparent that those equations are not infallible and that they fail to provide an accurate estimate of GFR in certain situations frequently encountered in clinical practice. After describing the processes that led to the development of the new GFR-estimating equations, this Review discusses the clinical situations in which the applicability of these equations is questioned.
Key Points
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Even when developed through rigorous process, creatinine-based equations for estimating glomerular filtration rate (GFR) are not systematically applicable to every clinical situation
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Examples of clinical situations in which the applicability of the commonly used equations has been questioned include particular ethnic groups, kidney transplant recipients and the elderly
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The applicability of the MDRD study equation and of the CKD-EPI equation has been more extensively documented than the applicability of the Cockcroft–Gault equation
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Although cystatin C—as a GFR marker—outperforms creatinine in many situations where equations are usually less accurate, cystatin-C-based GFR estimating equations have not yet been definitively validated
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The use of reference methods of GFR measurement in situations in which equations are known to be suboptimal should be considered
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Delanaye, P., Mariat, C. The applicability of eGFR equations to different populations. Nat Rev Nephrol 9, 513–522 (2013). https://doi.org/10.1038/nrneph.2013.143
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DOI: https://doi.org/10.1038/nrneph.2013.143
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