Abdominocentesis (Belly Tap / Peritoneal Fluid Drainage)

Abdominocentesis—commonly known as a "belly tap"—is a simple and minimally invasive procedure used to sample or remove free fluid that has accumulated inside a pet’s abdomen. With the pet gently resting on their side or standing, the veterinarian inserts a tiny sterile needle into the lower belly, often guided by ultrasound to target the largest pocket of fluid. In internal bleeding emergencies (such as a ruptured splenic tumor), it instantly confirms blood in the belly; in cats with suspected FIP, it collects sticky, high-protein fluid for testing; and in severe heart failure, it drains uncomfortable fluid pressure to help pets breathe and eat comfortably.