What does it feel like to hold urine in B ultrasound?

If you need to do B-ultrasound when choosing to drink water to hold urine, under normal circumstances, say to hold back to feel their urine is relatively high, this time to go to the hospital to choose to do B-ultrasound examination of the urinary system, should be more accurate. Normally, bladder filling should reach at least 70% above, you can see the entire urinary system has no abnormal situation exists. The results of this examination are relatively accurate. If there are obvious abnormalities in B-ultrasound, further examinations are needed, such as CT or MRI of the urinary system.