Patient is older than 65 years of age.
Prior documented deep vein thrombosis or pulmonary embolism.
Surgery requiring general anesthesia or lower extremity fracture in the past 4 weeks.
Solid or hematological malignancy currently active or treated within the last year.
Pain in one leg only, not explained by another cause.
Coughing up blood or blood-tinged sputum.
Resting heart rate in beats per minute at time of assessment.
Both findings must be present: pain on deep palpation of the lower-limb veins and unilateral edema of that limb. Either sign alone does not score.