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Modified SRU guidelines for the assessment of carotid artery stenosis.
| Degree of stenosis, % | ICA PSV, cm/s | Plaque estimate, % | ICA/CCA PSV ratio |
ICA EDV, cm/s |
|---|---|---|---|---|
| Normal | <180 | None | <2 | <40 |
| <50 | <180 | <50 | <2 | <40 |
| 50–69 | 180–230 | >50 | 2–4 | 40–100 |
| >70 | >230 | >50 | >4 | >100 |
| Near occlusion | High, low, or undetectable | Visible | Variable | Variable |
| Total occlusion | Undetectable | Visible, no detectable lumen | Not applicable | Not applicable |
