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- Title
The Estimation of Dietary Protein Intake in Chronic Renal Failure.
- Authors
Coles, G. A.; Meadows, J. H.; Bright, C.; Tomlinson, K.
- Abstract
Forty-five adult clinic patients with chronic renal failure each supplied a 4-day weighed dietary record, a 24-h urine collection, and a nocturnal spot urine sample. Total nitrogen (N) losses derived from the urines were corrected for proteinuria and non-urea nitrogen excretion. Individual estimates of N intake were compared by correlation and assessing the level of agreement. Daily urea N excretion derived from the spot sample correlated well with the 24-h collection <0.001, but the degree of agreement was poor, mean difference being +1.62 g with 95% limits of +5.7 to −2.47g. The correlation between the spot-sample-derived N loss and dietary N intakewas poor, =0.42; <0.05. For 12 patients taking a low-protein diet, N intake correlated well with 24-h urine derived N losses, <0.001, mean difference being +0.59g, 95% limits +2.39 to −1.21 g. The correlation and agreement was less satisfactory for the subjects who had not received dietary instruction, due largely to individual variation in day-to-day protein intake. Use of spot urine samples is too inaccurate for routine clinical practice. Single 24-h urine derived estimates of N intake are only of value for assessing patients previously prescribed a low-protein intake.
- Publication
Nephrology Dialysis Transplantation, 1989, Vol 4, Issue 10, p877
- ISSN
0931-0509
- Publication type
Article