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Estimation of nitrogen balance based on a six-hour urine collection in infants
Insights
A 6-hour urine collection accurately estimates 24-hour urinary urea nitrogen levels in infants, simplifying nitrogen balance calculations when longer collections are not feasible. This method supports clinical nutrition assessments in pediatric patients.
Area of Science:
- Pediatric Nephrology
- Clinical Chemistry
- Nutritional Science
Background:
- Accurate measurement of urinary urea nitrogen is crucial for assessing nitrogen balance in infants.
- Traditional 24-hour urine collections can be challenging to obtain in pediatric populations.
- Alternative methods for nitrogen balance assessment are needed.
Purpose of the Study:
- To evaluate the accuracy of a 6-hour urine collection compared to a 24-hour collection for determining urinary urea nitrogen in infants.
- To assess the utility of a shorter urine collection period for nitrogen balance calculations in pediatric patients.
Main Methods:
- 15 infants (2 weeks to 3 years) with normal renal function were studied.
- Indwelling Foley catheters were used for continuous 24-hour urine collection.
- Urinary urea nitrogen was measured using the urease enzymatic method (Astra) in both 6-hour and 24-hour samples.
Main Results:
- A highly significant correlation (r = 0.904, p < 0.0001) was found between 6-hour and 24-hour urine collections.
- The 6-hour collection accurately estimated 24-hour urinary urea nitrogen levels.
- Linear regression analysis confirmed the reliability of the shorter collection period.
Conclusions:
- A 6-hour urine collection is a viable and accurate alternative to a 24-hour collection for urinary urea nitrogen determination in infants.
- This method simplifies nitrogen balance assessment in pediatric patients when 24-hour collections are impractical.
- The findings support the use of shorter urine collection periods in clinical settings for pediatric nutritional management.
Abstract:
The accuracy of a 6-hr vs a 24-hr urine collection for the determination of urinary urea nitrogen was studied in 15 infants. Patient's age ranged from 2 weeks to 3 yr, encompassing a wide variety of diagnoses. All patients had normal renal function at the time of the study. Participants had indwelling foley catheters throughout the study. Urine specimens were collected over a continuous 24-hr period. Aliquots obtained from urine collected over 0 to 6 hr and the total urine collection were analyzed utilizing the urease enzymatic method in the Astra. Statistical analysis was performed comparing the actual 24-hr determination to the estimation based on the 6-hr collection, utilizing linear regression. The analysis of data produced a highly significant correlation (r = 0.904, p less than 0.0001). When a 24-hr urine collection is not possible, a 6-hr collection is a useful alternative for the calculation of nitrogen balance in infants.