An ultrasound scan, or ultrasound (USS) uses ultrasonography: non-ionising, high-frequency sound waves to characterise tissue.
USS is used for diagnosis and investigation (including in pregnant women, obstetric ultrasound) and to guide intervention (such as USS-guided FNA).
PoCUS is a specific example of USS.
NB: To avoid confusion, USS is used in place of US, which refers to the United States (of America).
Radiopaedia - Ultrasound
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