Journal Article

The need for robust validation for MDRD-based glomerular filtration rate estimation in various CKD populations

Kearkiat Praditpornsilpa, Natavudh Townamchai, Tawatchai Chaiwatanarat, Khajohn Tiranathanagul, Pisut Katawatin, Paweena Susantitaphong, Thananda Trakarnvanich, Talerngsak Kanjanabuch, Yingyos Avihingsanon, Kriang Tungsanga and Somchai Eiam-Ong

in Nephrology Dialysis Transplantation

Published on behalf of European Renal Association - European Dialysis and Transplant Assoc

Volume 26, issue 9, pages 2780-2785
Published in print September 2011 | ISSN: 0931-0509
Published online February 2011 | e-ISSN: 1460-2385 | DOI: http://dx.doi.org/10.1093/ndt/gfq815
The need for robust validation for MDRD-based glomerular filtration rate estimation in various CKD populations

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Background. Currently, estimated glomerular filtration rate (eGFR) equations have been validated only in Caucasians and African-Americans and is not applicable to people of other races/ethnicities as shown in studies conducted in two Asian populations: Chinese and Japanese. Because of this, it is important that eGFR equations are validated in its prospective population before applying it in the clinical setting and in epidemiologic studies. Therefore, we examined all eGFR equations available: reexpressed isotope dilution mass spectroscopy (IDMS)-traceable Modification of Diet in Renal Disease (MDRD) equation, Chronic Kidney Disease Epidemiology Collaboration (CKD-EPI) equation, Chinese equation and Japanese equation.

Methods. A total of 350 adult Thai CKD patients were studied. The 99mTc-DTPA plasma clearance was used as a reference for glomerular filtration rate (GFR). The serum creatinine was determined by IDMS reference enzymatic methods (CrEnz) and Jaffe’s kinetic assay (CrJaffe) as indicated in each equation.

Results. The disagreement between the reference GFR and eGFR (reference GFR minus eGFR) was 9.6 mL/min/1.73 m2 for the reexpressed IDMS-traceable MDRD equation, 8.0 mL/min/1.73 m2 for CKD-EPI equation, 1.9 mL/min/1.73 m2 for eGFR equation from the Chinese study and 20.9 mL/min/1.73 m2 for the eGFR equation from the Japanese study. The Thai coefficient for the reexpressed MDRD was 1.129. The reexpressed MDRD equation for Thais is as follows: 175 × CrEnz (−1.154) × Age (−0.203) × 0.742 (if female) × 1.129 (if Thai). When stepwise multiple regression analysis was used, the Thai eGFR formula is: 375.5 × CrEnz (−0.848) × Age (−0.364) × 0.712 (if female).

Conclusions. Differences in race/ethnicity can significantly affect the results obtained from MDRD-based eGFR equation. It is highly recommended that each population should validate eGFR equations before applying the equation in epidemiologic studies or clinical use.

Keywords: CKD; eGFR equation; glomerular filtration rate

Journal Article.  3612 words.  Illustrated.

Subjects: Nephrology

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