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There are several different types of sound waves, and the prefix 'ultra' in this sense refers to a sound wave being above 20,000 Hertz. Diagnostic medical sonography is 2MHz (2 million Hertz) or above. See also infrasound and acoustic sound waves.

The abbreviation, on the other hand, is frequently cited as U/S.

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12y ago
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Q: What is the prefix for ultrasound?
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