1985
DOI: 10.1080/07315724.1985.10720100
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A simple method for estimating nitrogen balance in hospitalized patients: a review and supporting data for a previously proposed technique.

Abstract: Total urinary nitrogen (TUN) and urinary urea nitrogen (UUN) in a 24-hour urine collection were measured under a variety of clinical and nutritional conditions in 81 patients for 564 study days. The difference between TUN and UUN averaged 1.8 +/- 0.9 g/day (range 0.0-5.8 g/day) and was independent of the absolute value for UUN. Since UUN was found to correlate linearly with TUN (R = 0.98) over a wide range of values, it is possible to estimate an approximate TUN excretion by adding a constant to the nitrogen e… Show more

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Cited by 61 publications
(23 citation statements)
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“…Urine urea, creatinine, and uric acid were measured with a Cobas c311 analyzer (Roche Diagnostics). Total protein intake was estimated based on urinary nitrogen excretion and corrected for nonurinary losses with a standard factor of 4 g (35).…”
Section: Urine Analysismentioning
confidence: 99%
“…Urine urea, creatinine, and uric acid were measured with a Cobas c311 analyzer (Roche Diagnostics). Total protein intake was estimated based on urinary nitrogen excretion and corrected for nonurinary losses with a standard factor of 4 g (35).…”
Section: Urine Analysismentioning
confidence: 99%
“…8,[12][13][14][18][19][20] This latter fact may be explained because 56.4% of our patients were fed using the parenteral route (see &dquo;Results&dquo;). In addition, patients with enteral nutrition received highly digestible enteral products and were observed mainly for a period of 1 to 2 weeks (Table III) after the date of admission or operation, a time which frequently coincides with slower gastrointestinal transit.…”
Section: Discussionmentioning
confidence: 98%
“…We measured TNO in 124 surgical patients over 990 days (TNO, 19.22 ±8.72 g N/ day; total urinary nitrogen (TUN) 18.17 ± 8.70 g N/day; UUN, 15.17 ± 7.70 g N/day; mean gastrointestinal nitrogen (MGIN) 0.68 ± 0.49 g N/day; integumental nitrogen (ITGN), 0.34 ± 0.08 g N/day) and compared the results with the daily estimations using three different formulas: formula A, UUN + 4; formula B, UUN x 1.20 + 1.05, where 1.20 is the reciprocal of the mean ratio UUN/TUN and 1.05 the mean extraurinary nitrogen losses; and formula C, UUN x 1.0986 + 2.55, derived from the regression analysis of UUN us TNO. TNO estimated by these formulas were 19.17 ± 7.70, 19.26 ± 9.24, and 19.22 ± 8.70 g N/day, respectively.…”
mentioning
confidence: 99%
“…NBs were then calculated using the following equation: 12 where protein intake is measured in grams (6.25 is the conversion factor for calculating the nitrogen in a given amount of protein); 24 h UUN losses are added to an average amount of 4 grams of insensible (or nonurinary) nitrogen losses or 2 grams in the stool plus 2 grams from the skin.…”
Section: Methodsmentioning
confidence: 99%