Which of the following is a key initial imaging or lab step when evaluating foal colic with suspected uroabdomen?

• A. Abdominal ultrasound showing free fluid with no organ abnormalities
• B. Blood typing
• C. Skin scraping
• D. Radiographs of limbs

Answer: (A)

When a foal has colic and uroabdomen is suspected, the first useful test is an abdominal ultrasound to look for free intraperitoneal fluid. Detecting free fluid in the abdomen supports the idea that urine has leaked into the peritoneal cavity and helps distinguish uroabdomen from other abdominal problems that might show localized organ abnormalities or no free fluid. If free fluid is found, that finding guides further confirmation with peritoneal fluid analysis (comparing peritoneal and blood values) to confirm uroperitoneum. The other options don’t address the inside of the abdomen: blood typing, skin scraping, and limb radiographs are not relevant to evaluating suspected uroabdomen in this setting.