Purpose: Well’s Criteria was developed in order to predict the likelihood of the presence of a deep vein thrombosis (DVT) prior to radiological intervention.


1. Active Cancer (treatment ongoing or within previous 6 months): + 1 Point
2. Paralysis, paresis or recent plaster immobilization of the LE: + 1 Point
3. Recently bedridden for 3 days or more, or major surgery within the previous 12 weeks requiring anesthesia: + 1 Point
4. Localized tenderness along the distribution of the deep venous system: + 1 Point
5. Entire leg swelling: + 1 Point
6. Calf Swelling at least 3cm larger than asymptomatic leg (measured 10cm below tibial tub): + 1 Point
7. Pitting Edema confined in symptomatic leg: + 1 Point
8. Collateral superficial veins (nonvaricose): + 1 Point
9. Previous DVT: + 1 Point
10. Alternative diagnosis at least as likely as a DVT: – 2 Points

> 3: High Probability
1-2: Moderate Probability
0: Low Probability


1. Hargett CW, et al. Clinical probability and D-dimer testing: How should we use them in clinical practice? Semin Respir Crit Care Med. 2008; 29(1): 15–24.

2. Wells PS, et al. Value of assessment of pretest probability of deep-vein thrombosis in clinical management. Lancet. 1997; 350: 1795-1798.

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