What happens during a bladder ultrasound?

Ultrasound. You will be expected to lye on your back with a full bladder while the technologist takes images of the bladder. Then, you will empty the bladder and the tech will take more pictures using the ultrasound machine.
Several things. Patients are asked to drink water prior to the test. In the ultrasound room, patients lay on their back on a stretcher and a towel is placed along the pelvis. The sonographer will place warm gel on the pelvis. Using an ultrasound probe on the pelvis, the sonographer will take pictures. Patients will be asked to empty their bladder, and will have more pictures taken to see how much urine remains.