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Obstetric Ultrasound

Ultrasound imaging, also called ultrasound scanning or sonography, is a method of obtaining images of internal organs by sending high-frequency sound waves into the body. The sound wave echoes which have a frequency higher than people can hear are recorded and displayed as a real-time visual image. No ionizing radiation (x-ray) is involved in ultrasound imaging. Obstetric ultrasound refers to the specialized use of sound waves to visualize and thus determine the condition of a pregnant woman and her embryo or fetus.

Obstetric Ultrasound Preparation

These instructions are IMPORTANT. Please follow them.

• You should wear a loose fitting two-piece outfit for the examination. Only the lower abdominal area needs to be exposed during this procedure; consequently, a two-piece outfit will prevent you from having to readjust or remove all of your clothing.


• You will be required to have a full bladder for the procedure. Air interferes with sound waves, so if your bladder is distended, the air-filled bowel is pushed out of the way and an image of the uterus and embryo or fetus is obtained. The radiologist or sonographer may elect to examine an early pregnancy or the cervix by means of transvaginal ultrasound. This requires an empty urinary bladder.


• You will be provided additional instructions when you make your appointment.