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Prevalence Clinical features Differential diagnosis Investigations Therapy Prevention Prognosis

Investigations Moderate risk for DVT Positive scan: DVT Negative scan: Repeat the scan in one week and withhold anticoagulation. If it is positive: DVT If it is negative: no DVT Why? Few patients have a positive second scan. In a study that scanned again all patients with a first negative scan, only 0.9%, had a positive second scan and 0.06% developed further symptoms in the intervening week. a DVT is very rare if two scans are negative: 0.6% of patients with 2 negative ultrasounds a week apart develop a DVT in the next 3 months. a

Expiry date: January 2004
Levels of Evidence used in grading these guides