A single urine sodium measurement may validly estimate 24-hour urine sodium excretion in patients with an ileostomy

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Background: Sodium deficiency in patients with an ileostomy is associated with chronic dehydration and may be difficult to detect. We aimed to investigate if the sodium concentration in a single spot urine sample may be used as a proxy for 24-hour urine sodium excretion.

Methods: In a prospective observational study with 8 patients with an ileostomy and 8 volunteers with intact intestines, we investigated the correlations and agreements between spot urine sodium concentrations and 24-hour urine sodium excretions. Spot urine samples were drawn from every micturition during 24 hours, and relevant blood samples were drawn. All participants documented their food and fluid intakes.

Results: There was a high and statistically significant correlation between 24-hour natriuresis and urine sodium concentrations in both morning spot samples (n = 8, Spearman's rho [ρ] = 0.78, P = 0.03) and midday spot samples (n = 8, ρ = 0.82, P = 0.02) in the patients with an ileostomy. The agreement between methods was fair (bias = -1.5, limits of agreement = -32.3 to 29.4). There were no statistically significant associations for evening samples or for samples from volunteers with intact intestines independently of time of day.

Conclusion: A single spot urine sodium sample obtained in the morning or midday may estimate 24-hour urine sodium excretion in patients with an ileostomy and thus help to identify sodium depletion.

Original languageEnglish
JournalJournal of Parenteral and Enteral Nutrition
Issue number2
Pages (from-to)246-255
Number of pages10
Publication statusPublished - 2020

Bibliographical note

© 2019 The Authors. Journal of Parenteral and Enteral Nutrition published by Wiley Periodicals, Inc. on behalf of American Society for Parenteral and Enteral Nutrition.

    Research areas

  • Faculty of Science - Dehydration, Ileostomy, Natriuresis, Short bowel syndrome, Water-electrolyte balance

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