| In most cases, uroperitoneum can be diagnosed based on the results of ultrasonography and abdominocentesis and calculation of the peritoneal-to-serum creatinine concentration ratio. |
| Abdominocentesis yields light yellow fluid. |
| An abdominocentesis was not performed due to the risk of perforating the abdominal mass. |
| Ultrasonographic examination revealed severe ascites and abdominocentesis yielded clear yellow fluid with high urea and creatinine concentrations, which supported a diagnosis of uroperitoneum. |
| The fluid appeared homogeneous and anechoic, and abdominocentesis yielded clear yellow fluid that smelled of urine. |
| Other diagnostic tools such as abdominocentesis and fine needle aspiration of the spleen were not utilized because of the poor condition of the animal, and immediate surgical intervention was selected. |
