Ann Lab Med 2019; 39(2): 205-208  https://doi.org/10.3343/alm.2019.39.2.205
Estimated Glomerular Filtration Rates Show Minor but Significant Differences Between the Single and Subgroup Creatinine-Based Chronic Kidney Disease Epidemiology Collaboration Equations
Sholhui Park, M.D. and Tae-Dong Jeong, M.D., Ph.D.
Department of Laboratory Medicine, College of Medicine, Ewha Womans University, Seoul, Korea
Corresponding author: Tae-Dong Jeong, M.D. https://orcid.org/0000-0002-3873-3117
Department of Laboratory Medicine, College of Medicine, Ewha Womans University, 1071 Anyangcheon-ro, Yangcheon-gu, Seoul 07985, Korea
Tel: +82-2-2650-2822
Fax: +82-2-2650-5091
E-mail: tdjeong@ewha.ac.kr
Received: January 9, 2018; Revised: April 5, 2018; Accepted: September 20, 2018; Published online: March 1, 2019.
© Korean Society for Laboratory Medicine. All rights reserved.

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract
The creatinine-based Chronic Kidney Disease Epidemiology Collaboration (CKD-EPI) equation can be calculated according to race, sex, and creatinine concentration (subgroup equation) or in the form expressed by one equation (single equation). Minor differences in the constants used in the CKD-EPI equations (subgroup vs single equations) could result in a significant difference in the estimated glomerular filtration rate (eGFR). We evaluated the impact of this difference in 79,709 Korean patients. The eGFR was calculated as an integer using the single and subgroup CKD-EPI equations. The differences in eGFR and GFR categories between the equations were analyzed. eGFR was higher in the subgroup equation than the single equation by 1 mL/min/1.73 m2 for 12,476 (27.4%) Korean females. The GFR category based on the subgroup equation was reclassified using the single equation for 352 (0.77%) females. Based on the results, the constant of the single equation was optimized. There was no difference in eGFR values between equations using a multiplier of 1.0213 instead of 1.018 for the “white or other” females constant in the single CKD-EPI equation. Clinicians should carefully apply the CKD-EPI equation because eGFR values may differ by 1 mL/min/1.73 m2 depending on the manner of calculation. To minimize these differences, the constants of the single equation should be revised.
Keywords: Creatinine-based Chronic Kidney Disease Epidemiology Collaboration equation, Constant modification, Glomerular filtration rate



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