Improving Emergency Department Testing for Deep Vein Thrombosis

Exclusion Criteria

• •\<18 years of age;
• •tested for DVT without using the ToDay algorithm at the index visit;
• •D-dimer level is known before ToDay item assessment;
• •a new indication for anticoagulation at the emergency department assessment (other than DVT) in a patient not previously prescribed an anticoagulant;
• •a history of prior lower limb DVT, where there is no access to baseline ultrasound imaging;
• •suspected of having a pulmonary embolism;
• •has previously participated in this study;
• •has previously opted out of all research at hospital site;
• •left the emergency department or urgent care centre against medical advice;
• •D-dimer was ordered prior to initial physician assessment;
• •imaging for DVT or pulmonary embolism within the previous 30 days;
• •transferred from another hospital organization.