Abdominocentesis is the process of removing fluid from the abdomen by means of a needle or catheter. When fluid builds up in the abdomen it is called ascites. This build up of fluid can be caused by a number of different diseases including heart failure, liver damage, ruptured bladder, and cancer to name a few. At Raleigh Hills Animal Hospital, we use an ultrasound to help guide us and find the fluid. Abdominocentesis can be used solely as a diagnostic test or as a treatment. Collecting a sample for analysis can help determine what process is causing the fluid to develop in your pet. Abdominal fluid can be uncomfortable for your pet, and sometimes it is recommended to drain off as much as possible. Your veterinarian will make a recommendation of which type of abdominocentesis is appropriate for your pet. A few things to watch for are lethargy, vomiting, loss of appetite, abdominal distension, signs of discomfort when lying down or when touching the stomach as these can be signs of illness and abdominal fluid build up.