Peer-reviewed veterinary case report
IV contrast dye briefly raises urine concentration and pH in dogs
By Barthe, Swann et al.·Published in Journal of the American Veterinary Medical Association·2026·1Diagnostic Imaging Department, France·View original on PubMed →
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Original publication title: Intravenous iodinated contrast media transiently increases urine specific gravity and pH without affecting other urinalysis parameters after computed tomography examination in dogs.
- Species:
- dog
Plain-English summary
A group of 30 dogs undergoing a CT scan with a special contrast dye had their urine tested before and shortly after the procedure. The results showed that the contrast dye temporarily increased the urine's specific gravity and pH, but it didn't affect other important urine tests. This means that while the urine's concentration and acidity changed, other factors like protein levels remained stable. Veterinarians can still trust those other results for making decisions about the dog's health, but if urine concentration or acidity is crucial, it might be better to test the urine before the contrast is given.
People also search for: dog urine test results after CT scan · dog urine specific gravity changes · dog CT scan contrast effects
Abstract
OBJECTIVE: To evaluate the immediate influence of iopromide, a nonionic iodinated contrast medium for IV use, on urinalysis in dogs undergoing CT scanning, including urine specific gravity (USG), urine dipstick parameters, urinary sediment, and urinary protein-to-creatinine ratio (UPCR). METHODS: This prospective, 1-group pretest, post-test experimental study included 30 client-owned dogs undergoing CT between May 1 and July 31, 2024. Cystocentesis samples were collected immediately before and within 30 minutes after IV iodinated contrast medium (IVIC) administration and analyzed by the same laboratory. RESULTS: Following IVIC administration, median USG increased significantly from 1.046 (95% CI, 1.032 to 1.052) to 1.058 (95% CI, 1.044 to 1.068) and median urine pH increased significantly from 6.25 (range, 5 to 9) to 7 (range, 5 to 9). No significant changes were observed in other urine dipstick parameters, urinary sediment, or UPCR after IVIC administration. CONCLUSIONS: Our study suggests that IV iopromide transiently alters USG and pH in dogs, whereas other urinalysis parameters remain unaffected. Clinicians can rely on most urinalysis parameters, particularly proteinuria and sediment, to guide immediate clinical decisions. CLINICAL RELEVANCE: These findings provide practical guidance for accurate interpretation of urinalysis in dogs undergoing CT with contrast media. If USG or pH are critical for patient management, urinalysis should be performed before or on a different day than contrast administration.
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Search related cases →Original publication on PubMed: https://pubmed.ncbi.nlm.nih.gov/41719700/