What is the recommended test to diagnose urinary tract disease in dogs and cats with clinical signs?

• A. Urine culture
• B. Blood culture
• C. Urinalysis
• D. Imaging

Answer: (A)

Diagnosing urinary tract infection in dogs and cats with clinical signs relies on proving the presence of a specific organism in the urinary tract, and urine culture is the best way to do that. A culture isolates the bacteria, tells you exactly what organism is growing, and provides antibiotic susceptibility, so you can choose an effective treatment. This definitive confirmation helps distinguish true infection from mere contamination or colonization.

Urinalysis can raise suspicion by showing bacteria, white blood cells, or other abnormalities, but it can be misleading—bacteria seen on a dipstick or smear may be a contaminant or not reflect an active infection. Blood culture isn’t typically used to diagnose UTIs, and imaging is valuable for identifying structural issues like stones or obstruction, not for confirming infection. For culture accuracy, samples are often collected by cystocentesis to minimize contamination and ensure the result truly reflects the urinary tract.