Probability of Venous Thrombosis Wells Score Calculator

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Probability of Venous Thrombosis Wells Score

The WELLS score estimates a clinical probability of the diagnosis of deep vein thrombosis (DVT). A score below 1 implies a low probability of phlebitis. A score of 1 or 2 indicates an intermediate probability. A score greater than 2 indicates a high clinical probability.


Deep vein thrombosis is the consequence of the formation of a blood clot in a vein of large diameter, in the legs, arms, abdomen, etc. Deep vein thrombosis is a medical emergency because of its possible serious complications.

Deep vein thrombosis can occur spontaneously in a person with risk factors, or be the result of prolonged immobilization, damage to the walls of the veins or a decrease in the fluidity of the blood. All of these factors increase the risk of a clot forming in the deep veins.