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  • Title: Comparative performance of FAS equation and Asian modified CKD-EPI in the determination of GFR in Chinese patients with CKD with the 99mTc-DTPA plasma clearance as the reference method.
    Author: Gao JQ, Zhao FG, Huang JM, Shao FQ, Xie P.
    Journal: Nefrologia (Engl Ed); 2021; 41(1):27-33. PubMed ID: 33153776.
    Abstract:
    BACKGROUND: Glomerular filtration rate (GFR) is a useful index in many clinical conditions. However, very few studies have assessed the performance of full age spectrum (FAS) equation and the Asian modified Chronic Kidney Disease-Epidemiology Collaboration (CKD-EPI) equation in the approximation of GFR in Chinese patients with chronic kidney disease. OBJECTIVE: This study aimed to compare the diagnostic performance of the above two creatinine-based equations. METHODS: A well designed single-center cross-sectional study was performed and the GFR was determined by 3 methods separately in the same day: technetium-99m-diethylene triamine pentaacetic acid (99mTc-DTPA) dual plasma sample clearance method (mGFR); FAS equation method; Asian modified CKD-EPI equation method. The gold standard method was the mGFR. Equations performance criteria considered correlation coefficient, bias, precision, accuracy and the ability to detect the mGFR less than 60ml/min/1.73m2. RESULTS: A total of 160 patients were enrolled. The diagnostic performance of FAS showed no significant difference in the correlation coefficient (0.89 vs 0.89), precision (15.9 vs 16.1ml/min/1.73m2), accuracy (75.0% vs 76.3%) and the ability to detect the mGFR less than 60ml/min/1.73m2 (0.94 vs 0.94) compared with the Asian modified CKD-EPI equation in all participants. The FAS showed a negative bias, while the new CKD-EPI equation showed a positive bias (-1.20 vs 1.30ml/min/1.73m2, P<0.001). However, they were all near to zero. In the mGFR<60ml/min/1.73m2 subgroup and mGFR>60ml/min/1.73m2 subgroup were consistent with that in the whole cohort. The precision and accuracy decreased when GFR>60ml/min/1.73m2 in both equations. CONCLUSIONS: The FAS equation and the Asian modified CKD-EPI equation had similar performance in determining the glomerular filtration rate in the Chinese patients with chronic kidney disease. Both the FAS equation and Asian modified CKD-EPI can be a satisfactory method and may be the most suitable creatinine-based equation.
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