If you had this, do you have to fast before it I can't remember??

Ultrasounds are noninvasive, so I don't see why you would have to be NPO. The purpose of NPO is to make sure the patient doesn't vomit from use of sedation or the introduction of tools down either the airway or esophagus, because you could develop aspiration pneumonia. If that's the only procedure you have planned, it shouldn't be NPO (at least in my nursing experience, but guidelines change all the time, so call the day before just to be 100%).

If you had this' date=' do you have to fast before it I can't remember??[/quote']

For mine it was no food or drink after 11pm the day before the ultrasound. I'm pretty sure that's standard.

For mine it was no food or drink after 11pm the day before the ultrasound. I'm pretty sure that's standard.

You're right! I just looked it up. Sorry I was used to ultrasounds we do on the cardiac unit which is looking at the valves, and also renal ultrasounds--which neither require NPO. I completely overlooked when OP had mentioned gallbladder!

If you eat before your ultrasound they probably won't let you have it done. Eating makes your gallbladder contract and therefore completely ruins chances of accuracy