Ultrasound (cont.)

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Screening uses

Ultrasound may be used to screen for blood vessel diseases. By measuring blood flow and blockage in the carotid arteries, the test can predict potential risk for future stroke. Similarly, by measuring the diameter of the aorta in the abdomen, ultrasound can screen for aneurysm (abnormal dilatation) and the risk of rupture. These tests may be indicated for an individual patient or they may be offered as a community wide health screening assessment.

Therapeutic uses

Ultrasound may be used to help physicians guide needles into the body.

In situations where an intravenous line is required but it is difficult to find a vein, ultrasound guidance may be used to identify larger veins in the neck, chest wall, or groin.

Ultrasound may be used to guide a needle into a cavity that needs to be drained (for example, an abscess) or a mass that needs to be biopsied, where a small bit of tissue is removed for analysis.

What are the risks of ultrasound?

There are no known risks to ultrasound, and as technology has improved, the machines have become smaller, portable and available for use at the patient's bedside.

How do patients prepare for an ultrasound?

Preparation for ultrasound is minimal. Generally, if internal organs such as the gallbladder are to be examined, patients are requested to avoid eating and drinking with the exception of water for six to eight hours prior to the examination. This is because food causes gallbladder contraction, minimizing the size, which would be visible during the ultrasound.

In preparation for examination of the baby and womb during pregnancy, it is recommended that mothers drink at least four to six glasses of water approximately one to two hours prior to the examination for the purpose of filling the bladder. The extra fluid in the bladder moves air-filled bowel loops away from the womb so that the baby and womb are more visible during the ultrasound test.

Medically Reviewed by a Doctor on 1/29/2014

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