NDLI: Urine color as an indicator of urine concentration in pregnant and lactating women

Content Provider	Springer Nature Link
Author	McKenzie, Amy L. Muñoz, Colleen X. Ellis, Lindsay A. Perrier, Erica T. Guelinckx, Isabelle Klein, Alexis Kavouras, Stavros A. Armstrong, Lawrence E.
Copyright Year	2015
Abstract	Urine concentration measured via osmolality (U OSM) and specific gravity (U SG) reflects the adequacy of daily fluid intake, which has important relationships to health in pregnant (PREG) and lactating (LACT) women. Urine color (U COL) may be a practical, surrogate marker for whole-body hydration status. To determine whether U COL was a valid measure of urine concentration in PREG and LACT, and pair-matched non-pregnant, non-lactating control women (CON).Eighteen PREG/LACT (age 31 ± 1 years, pre-pregnancy BMI 24.3 ± 5.9 kg m−2) and eighteen CON (age 29 ± 4 years, BMI 24.1 ± 3.7 kg m−2) collected 24-h and single-urine samples on specified daily voids at five time points (15 ± 2, 26 ± 1, and 37 ± 1 weeks gestation, 3 ± 1 and 9 ± 1 weeks postpartum during lactation; CON visits were separated by similar time intervals) for measurement of 24-h U OSM, U SG, and U COL and single-sample U OSM and U COL.Twenty-four-hour U COL was significantly correlated with 24-h U OSM (r = 0.6085–0.8390, P < 0.0001) and 24-h U SG (r = 0.6213–0.8985, P < 0.0001) in all groups. A 24-h U COL ≥ 4 (AUC = 0.6848–0.9513, P < 0.05) and single-sample U COL ≥ 4 (AUC = 0.9094–0.9216, P < 0.0001) indicated 24-h U OSM ≥ 500 mOsm kg−1 (representing inadequate fluid intake) in PREG, LACT, and CON.Urine color was a valid marker of urine concentration in all groups. Thus, PREG, LACT, and CON can utilize U COL to monitor their daily fluid balance. Women who present with a U COL ≥ 4 likely have a U OSM ≥ 500 mOsm kg−1 and should increase fluid consumption to improve overall hydration status.
Starting Page	355
Ending Page	362
Page Count	8
File Format	PDF
ISSN	14366207
Journal	European Journal of Nutrition
Volume Number	56
Issue Number	1
e-ISSN	14351293
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2015-11-16
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Fluid intake Hydration status Biomarker Urine color Pregnant women Lactating women Nutrition
Content Type	Text
Resource Type	Article
Subject	Nutrition and Dietetics Medicine

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