Ultrasound imaging, also called ultrasound scanning or sonography, involves exposing part of the
body to high-frequency sound waves to produce pictures of the inside of the body. Ultrasound
exams do use ionizing radiation (x-ray). Because ultrasound images are captured in real-time, they
can show the structure and movement of the body’s internal organs, as well as blood flowing through
You should wear comfortable, loose-fitting clothing for your ultrasound exam. You will need to
remove all clothing and jewelry in the area to be examined. You may be asked to wear a gown
during the procedure.
Other preparation depends on the type of examination you will have. For some scans your doctor
may instruct you not to eat or drink for as many as 8 hours before your appointment. For others you
may be asked to drink up to six glasses of water two hours prior to your exam and avoid urinating so
that your bladder is full when the scan begins.
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