Mobile turbid sounds are a clinical sign unique to large intra-abdominal fluid accumulation, and a positive mobile turbid sound is often indicative of an abdominal fluid accumulation of more than 1000 ml. General mobile turbid sounds examination steps are as follows: 1. Ask the patient to take a flat position, relaxed, hands on both sides of the body. At this time, the fluid gathered on both sides of the abdominal cavity, intestinal tube floating on the surface of the abdominal fluid, percussion in the center of the navel to both sides, the percussion sound can be gradually changed from a drum sound to a turbid sound. 2, the patient was asked to take the side lying position, at this time, the water in the abdominal cavity due to gravity siltation on one side of the abdominal cavity. The intestinal canal is still floating on the water surface, and the percussion sounds can change from turbid to drum sounds from outside to inside.