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Any surgery or trauma?
History of cancer?
<72 hours
Likelihood of DVT
>72 hours
Low
1 point or less
High
D-Dimer Assay
2 points or more
Normal
Elevated
>500ng/ml
Duplex Ultrasound
Other aetiologies:
Musculoskeletal Problems
Duplex Ultrasound
+ evaluate systemic cause
DVT
Magnetic Resonance Venography to evaluate pelvic or distal DVT (if suspicion is high)