Kidney Ureter and Bladder Scan , thru sonography, is typically done to assess the kidney function and obstruction hence you r asked to do a pre and post void test. You need to get enough fluid prior to scan and drink plenty of water and don't void for first scan, later post void another scan is done.
Next Steps
post diagnosis reach out to us and we will help you with customised diet plan.
Health Tips
drink plenty of water take care