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Table 1 Asymptomatic VTE risk from screening studies (from the VTE Getting Started Kit, Patient Safety Institute of Canada; open source)

From: Venous thromboembolism prophylaxis may cause more harm than benefit: an evidence-based analysis of Canadian and international guidelines

Patient Group DVT Incidence (%)
Medical patients 10-26
Major gynecologic, urologic, or general surgery 15-40
Neurosurgery 15-40
Tibial fracture 20-40
Congestive heart failure 20-40
Stroke 11-75
Knee/hip arthroplasty 40-60
Hip fracture 40-60
Major trauma 40-80
Spinal cord injury 60-80
Critical care patients 15-80