20 week detailed scan

This is my first pregnancy & ill be going to my 20w detailed scan tomorrow @ KKH. Do we need to have full bladder or drink lots of water? Or its not necessary.

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did mine a few months back at KKH and I was asked to try to empty my bladder because full bladder can caused some shadows that will affect the imaging. Bring something sweet or cold to drink, just in case if sonographer need the baby to move during the scan.