OB : For pregnancies up to 25 weeks, drink 16 ounces of fluid one hour before the exam and do not empty your bladder until the test is completed.
For
pregnancies beyond 26 weeks, no special preparation is necessary.
Pelvic : Please drink 32 ounces of fluid one hour before your exam and do not empty your bladder until the test is completed.
Abdominal : Please do not smoke, drink, eat, or chew gum for 6 hours before the test.