Consensus panel grayscale and Doppler US criteria for diagnosis of ICA stenosis

Degree of stenosis (%)	Primary parameters		Additional parameters
Degree of stenosis (%)	ICA PSV (cm/sec)	Plaque estimate (%)^*	ICA/CCA PSV ratio	ICA EDV (cm/sec)
Normal	<125	None	<2.0	<40
<50	<125	<50	<2.0	<40
50 to 69	125 to 230	≥50	2.0 to 4.0	40 to 100
≥70 but less than near occlusion	>230	≥50	>4.0	>100
Near occlusion	High, low, or undetectable	Visible	Variable	Variable
Total occlusion	Undetectable	Visible, no detectable lumen	Not applicable	Not applicable

CCA: common carotid artery; EDV: end diastolic velocity; ICA: internal carotid artery; PSV: peak systolic velocity; US: ultrasound.

* Plaque estimate (diameter reduction) with grayscale and color Doppler US.

Reproduced with permission from: Grant EG, Benson CB, Moneta GL, et al. Carotid artery stenosis: Grayscale and Doppler ultrasound diagnosis—Society of Radiologists in Ultrasound Consensus Conference. Ultrasound Q 2003; 19(4):190-8. Copyright © 2003 Wolters Kluwer Health, Inc. https://journals.lww.com/ultrasound-quarterly/pages/default.aspx.

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Consensus panel grayscale and Doppler US criteria for diagnosis of ICA stenosis