TABLE 1:

Cut-off points for the quantification of internal carotid artery stenosis by use of CDS according to Nicolaides et al (15) for minimum false-positive and false-negative tests

Stenosis (%)^*	Duplex Velocity Criteria (m/s)
Stenosis (%)^*	PSV_ICA	EDV_ICA	PSV_ICA/PSV_CCA	PSV_ICA/EDV_CCA	EDV_ICA/EDV_CCA
<47%	<150	<80	<2	<10	<2.6
60%	150–250	80–130	2–3.2	7–10	<2.6
70%	150–250	>130	3.2–4	10–15	2.6–5.5
82%	>250	>130	>4	15–25	2.6–5.5
90%	>250	>130	>4	>25	>5.5

↵* Diameters determined by angiography according to NASCET criteria.
Note.—CDS indicates color Doppler sonography; PSV, peak systolic velocity; EDV, end diastolic velocity.