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Whether the bladder should be voided prior to an ultrasound is determined by the physicians and technicians prescribing and conducting the diagnostic procedures. In some cases, the instructions for the patient involve showing up with a full bladder for a series of images, then voiding the bladder so that it can imaged again empty. That way, the technicians get as complete a picture as possible of the bladder's functioning capacity.
In addition to getting good images of the bladder in both full and empty states, imaging may be used to locate any blockages in the urinary system that might be the cause of a problem.
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