Maternal nutrition. I. The urinary urea nitrogen/total nitrogen ratio as an index of protein nutrition

Samir N. Beydoun, Violeta G. Cuenca, Lois P. Evans, Richard H. Aubry

Research output: Contribution to journalArticle

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The spot and 24 hour urinary urea nitrogen/total nitrogen ( UN TN) ratio was investigated as an index of maternal protein nutrision, in both outpatients and patients under metabolic study. This ratio was found to correlate well with maternal protein nutrition. It was not influenced by caloric intake. In all the phases of this study, there was an excellent correlation between the UN TN ratio in the 24 hour and the single voided urine specimens. Thus, the test was found to be a simple, reliable, and clinically feasible means of assessing maternal protein nutritional adequacy. Preliminary observations showed a positive correlation between the UN TN ratio and birth weight. The historical background of the UN TN ratio as well as its implications for the future are discussed.

Original languageEnglish (US)
Pages (from-to)198-203
Number of pages6
JournalAmerican journal of obstetrics and gynecology
Issue number2
StatePublished - Sep 15 1972


ASJC Scopus subject areas

  • Obstetrics and Gynecology

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