EPO and deep vein thrombosis: For example, the EPO-TBI (Erythropoietin in Traumatic Brain Injury) trial documented a 17% incidence of DVT among patients with traumatic brain injury with once weekly ultrasound.[5] The PROTECT trial (PROphylaxis for ThromboEmbolism in Critical Care Trial) documented 10% incidence of DVT among nontrauma ICU patients with twice-weekly ultrasounds.[6] Similarly, a review of studies that examined DVT in postoperative hospitalized patients showed that surveillance studies reported much higher incidence of DVT than studies that reported symptomatic DVT only.[7]