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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.
When you schedule your exam, ask your doctor about this issue. Why it's important. Many moms-to-be don't need an ultrasound in the third trimester, but if you're over age 35 or your doctor wants to closely monitor your baby's growth, you may get one or more before baby is born.