Venous abnormality scoring method
| Score | 0 | 1 | 2 | 3 | 4 |
| Decreased vein patency | Smooth vessel, no irregularities | Contour irregularities, but no significant stenosis (<25%) | Stenosis<50% | Stenosis>50% | Occlusion |
| Collaterals | None | Present | |||
| Increased lumen susceptibility | None | Present, residual thrombotic changes |
If occlusion was found with a vein cast, vein patency was scored a 4. If vein was missing, with no vein cast, vein was rated not applicable or NA.