Abstract
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Effect of Picric Acid and Enzymatic Creatinine on the Efficiency of the Glomerular Filtration Rate Predicator Formula
by Ling Qiu, Xiuzhi Guo, Yan Zhu, Weilin Shou, Mengchun Gong, Lin Zhang, Huijuan Han, Guoqiang Quan, Tao Xu, Hang Li, Xuewang Li
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Background: To investigate the impact of serum creatinine measurement on the applicability of glomerular filtra-tion rate (GFR) evaluation equations.
Methods: 99mTc-DTPA plasma clearance rate was used as GFR reference (rGFR) in patients with chronic kidney disease (CKD). Serum creatinine was measureded using enzymatic or picric acid creatinine reagent. The GFR of the patients were estimated using the Cockcroft-Gault equation corrected for body surface area, simplified Modi-fication of Diet in Renal Disease (MDRD) equation, simplified MDRD equation corrected to isotopes dilution mass spectrometry, the CKD epidemiology collaborative research equation, and two Chinese simplified MDRD equa-tions.
Results: Significant differences in the eGFR results estimated through enzymatic and picric acid methods were ob-served for the same evaluation equation. The intraclass correlation coefficient (ICC) of eGFR when the creatinine was measured by the picric acid method was significantly lower than that of the enzymatic method. The assess-ment accuracy of every equation using the enzymatic method to measure creatinine was significantly higher than that measured by the picric acid method when rGFR was ≥ 60mL/min/1.73m2.
Conclusions: A significant difference was demonstrated in the same GFR evaluation equation using the picric acid and enzymatic methods. The enzymatic creatinine method was better than the picric acid method.
DOI: 10.7754/Clin.Lab.2012.120524
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