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[Comparison between the 3- and the 24-hour urine collection for creatinine clearance]
Insights
Assessing kidney function in children with renal disease, this study found no significant difference between 24-hour and three-hour urine collection methods for creatinine clearance. The shorter method is recommended for hospitalized children.
Area of Science:
- Pediatrics
- Nephrology
- Clinical Chemistry
Background:
- Renal diseases in children can significantly impair kidney function.
- Accurate assessment of endogenous creatinine clearance is crucial for managing pediatric kidney disease.
- Standard urine collection methods may pose challenges in certain pediatric populations.
Purpose of the Study:
- To compare the accuracy of 24-hour urine collection versus a three-hour consecutive urine collection for determining endogenous creatinine clearance in children with renal diseases.
- To evaluate the feasibility and reliability of a shorter urine collection protocol in pediatric patients.
Main Methods:
- Studied thirty children with diverse renal diseases and varying degrees of kidney function impairment.
- Each child underwent two urine collection procedures: a 24-hour collection and three consecutive 1-hour collections.
- Creatinine levels in blood and urine samples were determined using an autoanalyzer under hydrated conditions.
Main Results:
- No statistically significant differences were observed between the endogenous creatinine clearance values obtained from the 24-hour and the three-hour urine collection procedures.
- Both methods demonstrated comparable reliability in assessing renal function.
Conclusions:
- The three-hour urine collection method provides a reliable alternative to the traditional 24-hour collection for assessing creatinine clearance in children with renal diseases.
- This shorter protocol is particularly advantageous for hospitalized infants and young children, and in situations where complete 24-hour urine collection or patient hydration may be challenging.
Abstract:
Endogenous creatinine clearance was studied in thirty children with various renal diseases and variable degrees of functional deterioration. Two different procedures or urine collection were used on each child: 1) twenty-four-hour urine collection with one blood sample and immediately afterwards 2) three one-hour consecutive periods of urine collection, with one previous blood sample (the one used for the 24-hour procedure). Both procedures were carried out during hydration of the patient and creatinine was determined with the autoanalyzer in urine and blood samples. The results obtained with both procedures did not show significant difference. The three-hour periods procedure may be recommended for hospitalized patients, specially infants or young children, and also when the parents are not reliable enough for hydrating the patients and for performing a complete collection of urine in a 24 hour period.