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</div><div><span>Ultrasound</span></div></div>
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<article><div id="d-article"><div class="page-info"><div class="page-title"><a name="start" id="start">
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</a><h1 class="with-also" itemprop="name">Ultrasound</h1>
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</noscript></div><div class="main"><div id="ency_summary"><p>Ultrasound uses high-frequency sound waves to make images of organs and structures inside the body.</p></div><section><div class="section"><div class="section-header"><div class="section-title"><h2>How the Test is Performed</h2></div><div class="section-button"><button type="submit" aria-controls="section-1" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-1"><p>An ultrasound machine makes images so that organs inside the body can 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. </p><p>The test is done in the ultrasound or radiology department. </p><ul><li>You will lie down for the test.</li><li>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.</li><li>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. </li></ul></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>How to Prepare for the Test</h2></div><div class="section-button"><button type="submit" aria-controls="section-2" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-2"><p>Your preparation will depend on the part of the body being examined.</p></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>How the Test will Feel</h2></div><div class="section-button"><button type="submit" aria-controls="section-3" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-3"><p>Most of the time, ultrasound procedures do not cause discomfort. The conducting gel may feel a little cold and wet. You will feel the sonographer press the ultrasound probe against your body in the area they are reviewing.</p></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>Why the Test is Performed</h2></div><div class="section-button"><button type="submit" aria-controls="section-4" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-4"><p>The reason for the test will depend on your symptoms. An ultrasound test may be used to identify problems involving:</p><ul><li><a test="test" href="./007266.htm">Arteries in the neck</a></li><li><a test="test" href="./003775.htm">Veins or arteries in the arms or legs</a></li><li><a test="test" href="./003778.htm">Pregnancy</a></li><li><a test="test" href="./007667.htm">Pelvis</a></li><li><a test="test" href="./003777.htm">Abdomen and kidneys</a></li><li><a test="test" href="./003379.htm">Breast</a></li><li><a test="test" href="./003776.htm">Thyroid</a></li><li><a test="test" href="./003797.htm">Eye and orbit</a></li></ul></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>Normal Results</h2></div><div class="section-button"><button type="submit" aria-controls="section-5" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-5"><p>Results are considered normal if the organs and structures being examined look OK.</p></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>What Abnormal Results Mean</h2></div><div class="section-button"><button type="submit" aria-controls="section-6" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-6"><p>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.</p></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>Risks</h2></div><div class="section-button"><button type="submit" aria-controls="section-7" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-7"><p>There are no known risks. The test does not use ionizing radiation.</p></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>Considerations</h2></div><div class="section-button"><button type="submit" aria-controls="section-8" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-8"><p>Some types of ultrasound tests need to be done with a probe that is inserted into your body. Talk to your provider about how your test will be done.</p></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>Alternative Names</h2></div><div class="section-button"><button type="submit" aria-controls="section-Alt" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-Alt"><p>Sonogram</p></div></div></section><section><div class="section sec-mb"><div class="section-header"><div class="section-title"><h2>Images</h2></div><div class="section-button"><button type="submit" aria-controls="section-tnails" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div name="Images" class="section-body" id="section-tnails"><ul class="img-grid group">
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<li><img src="//medlineplus.gov/ency/images/ency/tnails/1058t.jpg" alt="Abdominal ultrasound" title="Abdominal ultrasound" class="side-img"/><a href="../imagepages/1058.htm">Abdominal ultrasound</a></li>
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<li><img src="//medlineplus.gov/ency/images/ency/tnails/1110t.jpg" alt="Ultrasound in pregnancy" title="Ultrasound in pregnancy" class="side-img"/><a href="../imagepages/1110.htm">Ultrasound in pregnancy</a></li>
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<li><img src="//medlineplus.gov/ency/images/ency/tnails/18040t.jpg" alt="17 week ultrasound" title="17 week ultrasound" class="side-img"/><a href="../imagepages/18040.htm">17 week ultrasound</a></li>
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<li><img src="//medlineplus.gov/ency/images/ency/tnails/18041t.jpg" alt="30 week ultrasound" title="30 week ultrasound" class="side-img"/><a href="../imagepages/18041.htm">30 week ultrasound</a></li>
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<li><img src="//medlineplus.gov/ency/images/ency/tnails/18051t.jpg" alt="Carotid duplex" title="Carotid duplex" class="side-img"/><a href="../imagepages/18051.htm">Carotid duplex</a></li>
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<li><img src="//medlineplus.gov/ency/images/ency/tnails/18056t.jpg" alt="Thyroid ultrasound" title="Thyroid ultrasound" class="side-img"/><a href="../imagepages/18056.htm">Thyroid ultrasound</a></li>
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<li><img src="//medlineplus.gov/ency/images/ency/tnails/18057t.jpg" alt="Ultrasound" title="Ultrasound" class="side-img"/><a href="../imagepages/18057.htm">Ultrasound</a></li>
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<li><img src="//medlineplus.gov/ency/images/ency/tnails/18058t.jpg" alt="Ultrasound, normal fetus - ventricles of brain" title="Ultrasound, normal fetus - ventricles of brain" class="side-img"/><a href="../imagepages/18058.htm">Ultrasound, normal fetus - ventricles of brain</a></li>
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<li><img src="//medlineplus.gov/ency/images/ency/tnails/23247t.jpg" alt="3D ultrasound" title="3D ultrasound" class="side-img"/><a href="../imagepages/19898.htm">3D ultrasound</a></li>
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<li><img src="//medlineplus.gov/ency/images/ency/tnails/18055t.jpg" alt="Ultrasound comparison" title="Ultrasound comparison" class="side-img"/><a href="../imagepages/18055.htm">Ultrasound comparison</a></li>
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</ul></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>References</h2></div><div class="section-button"><button type="submit" aria-controls="section-Ref" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-Ref"><p>Butts C. Ultrasound. In: Roberts JR, Custalow CB, Thomsen TW, eds. <em>Roberts and Hedges' Clinical Procedures in Emergency Medicine and Acute Care</em>. 7th ed. Philadelphia, PA: Elsevier; 2019:chap 66.</p><p>Fowler GC, Lefevre N. Emergency department, hospitalist, and office ultrasound (POCUS). In: Fowler GC, ed. <em>Pfenninger and Fowler's Procedures for Primary Care</em>. 4th ed. Philadelphia, PA: Elsevier; 2020:chap 214.</p><p>Merritt CRB. Physics of ultrasound. In: Rumack CM, Levine D, eds. <em>Diagnostic Ultrasound</em>. 5th ed. Philadelphia, PA: Elsevier; 2018:chap 1.</p><p>Morris AE, Adamson R, Frank J. Ultrasonography: principles and basic thoracic and vascular imaging. In: Broaddus VC, Ernst JD, King TE, et al, eds. <em>Murray and Nadel's Textbook of Respiratory Medicine</em>. 7th ed. Philadelphia, PA: Elsevier; 2022:chap 23.</p></div></div></section>
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