Compression Ultrasonography in Non-high Probability of Deep Vein Thrombosis

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