| Life Line Screening | Literature | ||
| Status | Definition (PSV) | Status | Definition (PSV as Correlated to Level of Stenosis) [2] |
| Normal | <110 cm/s, no apparent plaque | N/A | N/A |
| Mild/Moderate | <110 cm/s, with plaque | Mild | <150 cm/s, <50% stenosis |
| Moderate | 110 - 139 cm/s, caused by plaque | Moderate | 150 - 250 cm/s, 50% - 70% stenosis |
| Possibly Significant | 140 cm/s or greater, including occlusion | Significant | 250 - 400 cm/s, 70% - 90% stenosis |
| Critical | ≥300 cm/s, with trickle flow or unstable plaque | Severe | >400 cm/s, 90% - 99% stenosisa |