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. 2022 Aug 31;7(11):2474-2483.
doi: 10.1016/j.ekir.2022.08.025. eCollection 2022 Nov.

Population-Based Limits of Urine Creatinine Excretion

Bryan Kestenbaum  1 , Joachim H Ix  2 , Ron Gansevoort  3 , Michael L Granda  1 , Stephan J L Bakker  3 , Dion Groothof  3 , Lyanne M Kieneker  3 , Andy N Hoofnagle  1 , Yan Chen  1 , Ke Wang  1 , Ronit Katz  1 , David K Prince  1
Affiliations

Population-Based Limits of Urine Creatinine Excretion

Bryan Kestenbaum et al. Kidney Int Rep. .

Abstract

Introduction: The validity of a timed urine collection is typically judged by measurement of urine creatinine excretion, but prevailing limits may be unreliable. We sought to empirically derive population-based limits of excretion for evaluating the validity of a timed urine collection.

Methods: Covariate and 24-hour urine data were obtained from 3582 participants in the Chronic Renal Insufficiency Cohort (CRIC) study, 814 participants in the Modification of Diet in Renal Disease (MDRD) study, 1010 participants in the Jackson Heart Study (JHS), and 8536 participants in the Prevention of Renal Vascular End Stage Disease (PREVEND) study. Weight, height, age, sex, and serum creatinine concentrations were evaluated as potential predictors of urine creatinine excretion using Akaike Information Criteria, R-squared values, and deviance. Bias and precision of the fitted models were assessed by analyses of residuals. Agreement between 24-hour creatinine clearance and 125I-iothalamate clearance was assessed before and after exclusion of potentially invalid urine samples.

Results: A best-fitting model to predict 24-hour urine creatinine excretion among the 9199 discovery cohort members included sex-specific terms for weight, height, and age (R-squared = 0.328). This model had a median bias of +4.3 mg creatinine/day (95% confidence interval -5.6, +13.3 mg/day) in 4599 validation cohort members, and 82% of observed values were within 30% of predicted model. Serum creatinine concentrations only marginally improved model precision but reduced bias in persons with advanced chronic kidney disease (CKD).

Conclusion: The limits of urine creatinine excretion derived here represent the most valid and representative data for appraising the adequacy of a timed urine collection.

Keywords: creatinine, urine collection.

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Figures

None
Graphical abstract
Figure 1
Figure 1
Observed versus predicted values of 24-hour urine creatinine excretion in the discovery for (a) women and (b) men and in replication cohort for (c) women and (d) men.
See this image and copyright information in PMC

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