Urocystitis, as a nosological unit, explains the inflammatory process of acute or chronic nature in the bladder and urethra. This disease is quite common among cats kept indoors. Early diagnosis of urocystitis, in particular differential, is difficult and should be comprehensive, and include: collection of medical history, clinical examination of a sick animal, laboratory examination of urine, ultrasound (ultrasound diagnosis) of the urinary system. The article presents a clinical case from the

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... veterinary practice of diagnosing urocystitis in a domestic cat. The research was conducted according to generally accepted methods, using special equipment. Catheterization of the bladder was performed to select urine. Changes in the clinical condition characterized by oppression of the animal, pale mucous membranes, anorexia, dysuria, forced posture of the animal, hematuria. Urination in a sick animal is frequent and difficult, or no, hyperemia of the penis, there is pain on palpation of the bladder. In the urine of animals with urocystitis revealed a decrease in relative density to 1.017 g / m3 and an increase in pH to 6.6. Epithelial cells of the bladder, leukocytes (up to 10 cells in the field of view) and a significant number of erythrocytes were registered in the sediment. Biochemical examination diagnosed elevated urea content, which corresponded to 18.8 mmol / l and creatinine - 158.1 μmol / l, respectively. The results of ultrasonographic examination of the urinary system in a sick animal are highlighted. Changes in the size of the bladder due to significant filling of urine, diffuse thickening of its walls and the presence of sediment in the form of flakes, which is easily moved and visualized sharply echopositively. Diagnostic tests and their analysis confirmed the diagnosis of urocystitis in a domestic cat.