| % Stenosis | Peak Velocity | Velocity Ratio |
|---|---|---|
| Normal | <150 cm/s | <2 |
| 30-49% | 150-200 cm/s | 1.5:1-2:1 |
| 50-74% | 200-400 cm/s | 2:1-4:1 |
| >75-99% | >400 cm/s | >4:1 |
| Occlusion | No color saturation | NA |
'Size, G (2013). Inside Ultrasound Vascular Reference Guide. Inside Ultrasound, Incorporated' – Purchase Now