Urinary Urea Nitrogen: Too Insensitive for Calculating Nitrogen Balance Studies in Surgical Clinical Nutrition
- 1 March 1991
- journal article
- research article
- Published by Wiley in Journal of Parenteral and Enteral Nutrition
- Vol. 15 (2), 189-193
- https://doi.org/10.1177/0148607191015002189
Abstract
Urinary urea nitrogen (UUN) has been used as an estimate of total urinary nitrogen (TUN) when calculating nitrogen output for nitrogen balance (NB) studies. UUN is assumed to constitute 80 to 90% of the total nitrogen output; when estimating TUN from UUN, UUN values are multiplied by 1.25 to correct for non-urea nitrogen components. In order to evaluate the validity of estimating total urinary nitrogen output from measured UUN in a clinical setting, 491 UUN:TUN paired studies were performed on 24-hour urine collections in general surgical/trauma patients who had measured TUN outputs ranging from 0.04 to 54.0 g/d.This publication has 11 references indexed in Scilit:
- Validity of urinary urea nitrogen as a measure of total urinary nitrogen in adult patients requiring parenteral nutritionCritical Care Medicine, 1989
- Pyrochemiluminescence: real-time, cost-effective method for determining total urinary nitrogen in clinical nitrogen-balance studies.Clinical Chemistry, 1988
- Assessment of an Automated Chemiluminescence Nitrogen Analyzer for Routine Use in Clinical NutritionJournal of Parenteral and Enteral Nutrition, 1988
- Hourly Urine Nitrogen Values Do Not Reflect 24‐Hour Totals in Injured ChildrenNutrition in Clinical Practice, 1987
- 216 ALTERED URINARY NITROGEN EXCRETION IN SEPSIS AND LIVER FAILURE IN CRITICALLY-ILL CHILDRENPediatric Research, 1985
- Urinary urea: are currently available methods adequate for revival of an almost abandoned test?Clinical Chemistry, 1982
- Nitrogen estimation in biological samples by use of chemiluminescence.Clinical Chemistry, 1980
- Determination of optimal hyperalimentation infusion rateJournal of Surgical Research, 1975