How you prepare

By Mayo Clinic Staff

Most ultrasound exams require no preparation, with a few exceptions:

  • For some ultrasound exams, such as of the gallbladder, your doctor may ask that you not eat or drink for up to 6 hours before the exam.
  • Other ultrasound exams, such as of the pelvis, may require a full bladder, so your doctor might ask you to drink up to six glasses of water two hours before the exam and not urinate until the exam is completed.

When scheduling your ultrasound, ask your doctor for specific instructions for your exam.

Jan. 24, 2015