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Lower extremity deep venous thrombosis is a common, serious, often under-recognized diagnosis in the
critically ill patient. Its high association with pulmonary embolus necessitates both prompt diagnosis and constant
surveillance. Point of care ultrasonography by the treating physician is gaining popularity because of its high accuracy and
ease of performance coupled with an immediate response to a question often asked at the bedside. This review will
highlight the advantages of compression ultrasonography compared to other diagnostic modalities and gives a practical
approach in performing this simple exam by the critical care team.