| Diameter of stenosis (%) | Peak sytolic velocity* (m/s) | Peak diastolic velocity* (m/s) | Internal: common carotid artery velocity ratio† |
|---|---|---|---|
| 0-39 | <1.1 | <0.45 | <1.8 |
| 4-59 | 1.1-1.49 | <0.45 | <1.8 |
| 60-79 | 1.5-2.49 | 0.45-1.4 | 1.8-3.7 |
| 80-99 | 2.5-6.1 | >1.4 | >3.7 |
| >99 (critical) | Extremely low | NA | NA |
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