| Risk category | Criteria for designation |
|---|---|
| High risk | Incomplete examination |
| At least 1 sequence with ACEP <3 | |
| Incompressible veins | |
| Other reasons deemed by reviewer, for example, considerations for differential diagnosis such as a Baker's Cyst | |
| Low risk | Complete examination |
| All cine-loop sequences with ACEP ≥3 | |
| All veins are identified as compressible |
ACEP = American College of Emergency Physicians