Yes, the following are the preparations you need before doing ultrasound:
Abdomen, Abdominal, Aorta:
Avoid excess fats the night prior to the exam and solid food 8 hours before the exam. Small quantities of clear fluids are permitted.
Pelvic Only- Female & Male:
One hour prior to exam drink 4 cups of water (total 32 oz). Do NOT empty bladder.
Prostate-Transrectal:
The evening before the examination, take a fleet enema (purchase at the drug store). One hour prior to exam, drink 4 cups of water (total 32 oz.). Do NOT empty bladder.
Abdomen & Pelvic:
Avoid solid foods and excess fats 8 hours before the exam. Small quantities of clear fluids are permitted. One hour prior to exam drink 4 cups of water (total 32 oz.). Do NOT empty bladder.
Pregnancy:
One hour prior to the exam, drink the required amount of water
12 weeks – 4 cups (32 oz.)
14-24 weeks – 3 cups (24 oz.)
Over 24 weeks – 2cups (16 oz.)