| %Stenosis | Peak Systolic Velocity(PSV)(cm/sec) | PSV at stenosis/PSV proximal to the stenosis |
| Normal | <150 | <1.5 |
| 25-49% | 150-200 | 1.5-2.0 |
| 50-74% | 200-300 | 2.0-4.0 |
| 75-99% | >300 | >4.0 |
| Occlusion | No flow |
University of South Florida duplex criteria for lower extremity arterial stenosis