Which combination of diagnostics helps rule out ruptured urinary bladder in a foal?

• A. Ultrasound, chemistry
• B. Rectal exam, CBC
• C. IgG, ultrasound
• D. Barium, CBC

Answer: (A)

When trying to rule out a ruptured urinary bladder in a foal, you want information that directly shows the bladder’s status and whether urine has leaked into the abdomen. Ultrasound is ideal here because it lets you visualize the bladder for integrity and detect any free fluid in the peritoneal cavity that could indicate uroperitoneum. If the bladder looks intact and there’s no abnormal accumulation, rupture is less likely. The chemistry part comes from analyzing peritoneal fluid obtained by abdominocentesis. If the fluid has urine-like composition—high creatinine and electrolyte patterns typical of urine compared with serum—that would support rupture. If the peritoneal fluid doesn’t resemble urine, that argues against rupture. Taken together, ultrasound plus peritoneal fluid chemistry provides the most reliable way to rule out a ruptured bladder. The other options lack this combination of direct bladder assessment and urine-specific peritoneal fluid analysis.