Abstract
Background
Although renal inulin clearance (Cin) is the gold standard for evaluation of kidney function, it cannot be measured easily. Therefore, creatinine clearance (Ccr) is often used clinically to evaluate kidney function. Enzymatically measured Ccr was recently found to be much higher than Cin because of the tubular secretion of creatinine (Cr). This study compared three measures of renal clearance, inulin, 2-h Ccr, and 24-h Ccr, in children.
Methods
Kidney function was evaluated in 76 children (51 males and 25 females) aged 1 month to 18 years with chronic kidney disease (CKD) by three renal clearance methods at almost the same time.
Results
Correlations between each pair of three renal clearance measurements were determined. Approximate glomerular filtration rate (GFR) was equal to 62 % of 2-h Ccr or 76 % of 24-h Ccr.
Conclusion
Cr secretion by renal tubules was approximately 50 % of the GFR. In this study, we indicate that the measurements of 2-h Ccr or 24-h Ccr do not show true GFR but we could infer approximate GFR from the values. The use of 2- or 24-h Ccr might contribute to the treatment of pediatric CKD patients.
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Change history
22 August 2017
An erratum to this article has been published.
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Acknowledgments
This study was supported financially by the Kidney Foundation, Japan, which enabled us to examine blood and urine specimens. Human rights were fully respected in conducting this study in accordance with the Declaration of Helsinki. All subjects gave their informed consent prior to their inclusion in the study.
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An erratum to this article is available at https://doi.org/10.1007/s10157-017-1445-2.
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Uemura, O., Nagai, T., Yamakawa, S. et al. Assessment of kidney function in children by enzymatic determination of 2- or 24-h creatinine clearance: comparison with inulin clearance. Clin Exp Nephrol 20, 462–468 (2016). https://doi.org/10.1007/s10157-015-1166-3
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DOI: https://doi.org/10.1007/s10157-015-1166-3