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1 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.
For a transvaginal ultrasound, you should empty your bladder right before the procedure. Your doctor will explain the procedure to you and offer you the opportunity to ask any questions that you might have about the procedure. Based on your medical condition, your doctor may request other specific preparation.