All about urine: Longitudinal examination of urine pH, specific gravity, proteins, culture, and resistance profiles in healthy dogs

Author:

McGlynn Andrew,Mrofchak Ryan,Madan Rushil,Madden Christopher,Jahid Mohammad Jawad,Mollenkopf Dixie,Wittum Thomas,Justice Sheryl S.,Rudinsky Adam,Hokamp Jessica,Hale VanessaORCID

Abstract

AbstractBackgroundUrine is routinely evaluated in dogs to assess health. Reference ranges for many urine properties are well established, but the scope of variation in these properties over time within heathy dogs is not well characterized.ObjectivesLongitudinally characterize urine properties in healthy dogs over 3 months.AnimalsFourteen healthy client-owned dogs.MethodsDogs were evaluated for health; then, mid-stream free catch urine was collected from each dog at 12 timepoints: Mornings / afternoons of Days 1, 2, 3; end of Weeks 4, 5, 6, 7 and Months 2 and 3. Urine pH, urine specific gravity (USG), protein, cultures, and antimicrobial resistance profiles were evaluated at each timepoint.ResultsUrine pH varied significantly within and between dogs over time (Friedman’s test: withinp= 0.031; betweenp< 0.005). However, USG, protein, and bacterial richness of urine were consistent within dogs over time, and only varied significantly between dogs (Kruskal-Wallis: between allp< 0.005). Antimicrobial resistant isolates were identified in 13 out of 14 dogs with 71% (34 of 48) of the isolates demonstrating resistance to amoxicillin.Conclusions and clinical importance1) Urine pH should be assessed at multiple timepoints via pH meter prior to making clinical decisions. 2) Mid-stream free catch urine from multiple healthy dogs yielded high concentrations of bacteria in culture (>105CFU/mL) and should not be considered the only indicator of urinary tract infection. 3) Bacterial isolates demonstrated widespread resistance to amoxicillin / oxacillin underscoring the need for antimicrobial stewardship.

Publisher

Cold Spring Harbor Laboratory

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