After the bladder is full percussion in the bladder area is a cloudy sound. When the bladder is full, there is a large amount of urine in the lower abdomen, in which case there is a distinct turbid sound on percussion. In a non-filled condition, there is an intestinal tube occupying the area, in which case percussion is a tympanic sound. When the bladder fills up to the pubic bone, or even to the umbilicus in many cases, this indicates a large amount of urinary retention and should be treated with catheterization to prevent bladder rupture due to overfilling of the bladder and even worsening of urinary retention, causing the patient to develop uremia.