OB Ultrasound:

​15 weeks and under: Drink 32 oz. water 1 hour prior to exam and do not empty.
Patient is to have a full bladder upon arrival to adequately visualize the pelvic structures trans-abdominally.
The patient may continue a normal diet.
16-30 weeks: Drink 16 oz. water 1 hour prior to exam and do not empty.
Patient may continue a normal diet.
31+ weeks: No special preparation necessary.

Pelvis Ultrasound: 

Drink 32 oz. water 1 hour prior to exam time. Patient is to have a full bladder upon arrival for the exam to adequately visualize the pelvic organs trans-abdominally. The Patient may eat a normal diet. Do not empty bladder.

Renal Ultrasound: 

Drink 32 oz. water 1 hour prior to exam time so that a full bladder can be imaged if necessary. Patient may eat a normal diet.

Abdomen Ultrasound: 

No food or drink except medications and sips of water after midnight for morning exams. For afternoon exams, no food or drink except medications and sips of water 8 hours prior to exam. No coffee, gum, or smoking.