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Correlation between internal carotid artery stenosis and ultrasound velocity measurements. ICA, internal carotid artery; PSV, peak systolic velocity; EDV, end-diastolic velocity; CCA, common carotid artery
| ICA stenosis (%) | ICA PSV (cm/s) | ICA EDV (cm/s) | PSV ratio (ICA/CCA) |
|---|---|---|---|
| Normal | < 125 | < 40 | < 2.0 |
| < 50 | < 125 | < 40 | < 2.0 |
| 50–69 | 125–230 | 40–100 | 2.0–4.0 |
| > 70 | > 230 | > 100 | > 4.0 |
| Near-occlusion | Variable | Variable | Variable |
| Occlusion | - | - | Not applicable |
