Diagnostic evaluation of urea nitrogen/creatinine ratio in dogs with gastrointestinal bleeding

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Abstract

Background: Urea nitrogen/creatinine ratio (UCR) is a marker for upper gastrointestinal bleeding (GIB) in people. Objectives: To assess the usefulness of UCR to predict occult GIB and distinguish upper from lower GIB in dogs. Animals: Eighty-nine dogs with GIB and 65 clinically healthy dogs. Dogs were grouped according to 65 overt GIB and 24 occult GIB, and based on lesion localization (37 upper, 13 lower, and 8 both). Methods: Seventy-four dogs were included retrospectively and 15 dogs prospectively. Serum urea nitrogen and creatinine concentrations, UCR, hemoglobin concentration, hematocrit, mean corpuscular volume, and mean corpuscular hemoglobin concentration were compared between groups. Logistic regression models were fitted to assess if variables could distinguish occult GIB from being healthy and upper from lower GIB. Results: The UCR was significantly higher in dogs with overt GIB compared to control dogs (P =.02) and dogs with occult GIB (P =.05). The UCR was not significantly associated with occult GIB vs being healthy, or upper vs lower GIB (P >.05 each). Dogs with higher hemoglobin concentration and hematocrit had significantly lower odds of having occult GIB than being healthy (P

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Stiller, J., Defarges, A. M., Brisson, B. A., Bersenas, A. M. E., Pomrantz, J. S., Lang, B., & Pearl, D. L. (2021). Diagnostic evaluation of urea nitrogen/creatinine ratio in dogs with gastrointestinal bleeding. Journal of Veterinary Internal Medicine, 35(3), 1427–1438. https://doi.org/10.1111/jvim.16101

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