• Revista médica de Chile · Nov 2021

    [Comparative performance of urinary creatinine excretion estimating equations].

    • Juan Pablo Huidobro E, Jorge Vega, SepúlvedaRodrigo ARADepartamento de Nefrología, Facultad de Medicina, Pontificia Universidad Católica de Chile, Santiago, Chile., and Andrés Astorga.
    • Departamento de Nefrología, Facultad de Medicina, Pontificia Universidad Católica de Chile, Santiago, Chile.
    • Rev Med Chil. 2021 Nov 1; 149 (11): 1561-1568.

    Background24-hour urine collection accuracy is generally evaluated based on the values of urine creatinine (UCr) excretion, usually using ranges adjusted by weight. UCr excretion depends on several factors. Equations to estimate UCr in 24-hour collection (UCr/24h) that consider these factors have been developed. However, these formulas have not been evaluated in a sample of Latinamerican origin.AimTo evaluate the performance of the existing UCr/24 h estimation equations in a sample of Latinamerican origin.Material And Methods24-hour urine collections from 181 ambulatory patients were analyzed. Measured UCr/24h was compared with estimated UCr (eUCr) through the equations of Ix (CKD-EPI), Gerber-Mann, Goldwasser, Cockcroft-Gault, Rule, Walser, Kawasaki, Tanaka and Huidobro. Performance of the nine equations to estimate UCr/24h was evaluated with the Pearson correlation and Lin concordance coefficients, and Bland-Altman method. Bias, precision, and accuracy (percentage of collections within 30% of measured UCr or P30) were also calculated.ResultsMeasured UCr/24h in the 181 patients was 1236 + 378 mg. Correlation coefficient (Pearson) of the eUCr/24h with the equations of Walser, Ix and Huidobro and the measured UCr/24h was strongly positive. Rule and Kawasaki equations had the lowest positive correlation coefficients. Bias was similar using the formulas of Walser, Goldwasser, Kawasaki, Ix and Huidobro. Walser, Ix, Huidobro, Cockcroft-Gault and Goldwasser equations had good accuracy (P30 > 85%), while Gerber-Mann, Tanaka, Rule and Kawasaki formulas had a P30 < 65%.ConclusionsWalser, Ix and Huidobro equations had the best performance to estimate UCr/24h excretion in a population of latinamerican origin.

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