Inclusion Criteria:  adult patient Patient presenting to the emergency department with clinical suspicion of DVT (i.e. pain and/or lower extremity edema). Patient with a non-high probability according to the modified Wells score, i.e. a score of 0 or 1 Subject with a social health insurance plan Subject able to understand the objectives and risks of the research and to give a signed and dated informed consent  Exclusion Criteria:  Patient with suspected pulmonary embolism Patient with a high probability of DVT Impossible to perform a whole leg doppler ultrasound within 5 days Pregnant or breast-feeding woman, on patient's declaration Subject under court protection Subject under guardianship or curatorship