In Well's criteria for DVT, which of the following is NOT a clinical feature that counts for points?

In Well's criteria for deep vein thrombosis (DVT), each clinical feature is assigned specific points to assess the probability of DVT in a patient. The criteria focus on risk factors and clinical presentations that can indicate the likelihood of thrombosis.

The presence of active cancer, local tenderness along the deep vein, and unilateral leg swelling are all significant features that can contribute to a higher score in evaluating the risk for DVT. Each of these factors directly correlates with an increased risk of thrombus formation.

On the other hand, while a prior history of DVT is relevant in the overall assessment of a patient’s risk for venous thromboembolism, it is not included as a point-earning feature in the original Well's criteria. The scoring system emphasizes current clinical signs and symptoms rather than historical factors, which is why a prior history does not count towards the scoring system in this context. Understanding the specific criteria helps in accurately assessing patients and guiding further management and investigation for DVT.