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Ultrasound

Definition

Ultrasound uses high-frequency sound waves to make images of organs and structures inside the body.

Alternative Names

Sonogram

How the Test is Performed

An ultrasound machine creates makes images so that organs in the body to be examined. The machine sends out high-frequency sound waves, which reflect off body structures. A computer receives the waves and uses them to create a picture. Unlike with an x-ray or CT scan, this test does not use ionizing radiation.

The test is done in the ultrasound or radiology department.

  • You will lie down for the test.
  • A clear, water-based gel is applied to the skin on the area to be examined. The gel helps with the transmission of the sound waves.
  • A handheld probe called a transducer is moved over the area being examined. You may need to change position so that other areas can be examined.

How to Prepare for the Test

Your preparation will depend on the part of the body being examined.

How the Test will Feel

Most of the time, ultrasound procedures do not cause discomfort. The conducting gel may feel a little cold and wet.

Why the Test is Performed

The reason for the test will depend on your symptoms.

Normal Results

Results are considered normal if the organs and structures being examined look okay.

What Abnormal Results Mean

The meaning of abnormal results will depend on the part of the body being examined and the problem found. Talk to your health care provider about your questions and concerns.

Risks

There are no known risks. The test does not use ionizing radiation.

Considerations

Some types of ultrasound tests need to be done with a probe that is inserted into your body. Talk to your health care provider about how your test will be done.

References

Cosgrove DO, Meire HB, Lim A, Eckersley RJ. Ultrasound: general principles. In: Adam A, Dixon AK, eds. Grainger & Allison's Diagnostic Radiology: A Textbook of Medical Imaging. 5th ed. New York, NY: Churchill Livingstone; 2008:chap 3.


Review Date: 11/9/2012
Reviewed By: David C. Dugdale, III, MD, Professor of Medicine, Division of General Medicine, Department of Medicine, University of Washington School of Medicine, Seattle, WA. Also reviewed by A.D.A.M. Health Solutions, Ebix, Inc., Editorial Team: David Zieve, MD, MHA, David R. Eltz, Stephanie Slon, and Nissi Wang.
The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. A licensed medical professional should be consulted for diagnosis and treatment of any and all medical conditions. Call 911 for all medical emergencies. Links to other sites are provided for information only -- they do not constitute endorsements of those other sites. © 1997- A.D.A.M., Inc. Any duplication or distribution of the information contained herein is strictly prohibited.
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