Malignancy (including treatment up to six months previously)
Intravenous drug use
Alternative diagnosis as more likely than DVT
Pre-test Clinical probability of a DVT with score:
DVT "Likely" if Well's > 1
DVT "Unlikely" if Wells< 2
Wells criteria / scoring for PE
Clinical Signs and Symptoms of DVT?
PE is No. 1 Dx or Equally likely Dx
Heart Rate > 100
Immobilization at least 3 days, or Surgery in the Previous 4 weeks
Previous, objectively diagnosed PE or DVT?
Malignancy with treatment within 6 months, or palliative?
Pre-test clinical probability of a PE:
Wells Score > 4 - PE likely. Consider diagnostic imaging.
Wells Score 4 or less - PE unlikely. Consider D-dimer to rule out PE.
2003 BTS Guidelines - a practical approach to ? PE (not using the Wells criteria) are available in the PE page
Wells PS, Owen C, Doucette S, Fergusson D, Tran H. Does this patient have deep vein thrombosis? JAMA. 2006 Jan 11;295(2):199-207.
Scarvelis D, Wells PS. Diagnosis and treatment of deep-vein thrombosis. CMAJ. 2006 Oct 24;175(9):1087-92. Review. Erratum in: CMAJ. 2007 Nov 20;177(11):1392.
Wells PS, Anderson DR, Rodger M, Forgie M, Kearon C, Dreyer J, Kovacs G, Mitchell M, Lewandowski B, Kovacs MJ. Evaluation of D-dimer in the diagnosis of suspected deep-vein thrombosis. N Engl J Med. 2003 Sep 25;349(13):1227-35.
Derivation of a simple clinical model to categorize patients probability of pulmonary embolism: increasing the models utility with the SimpliRED D-dimer. Thromb Haemost. 2000 Mar;83(3):416-20.
Writing Group for the Christopher Study Investigators. Effectiveness of Managing Suspected Pulmonary Embolism Using an Algorithm Combining Clinical Probability, D-Dimer Testing, and Computed Tomography. JAMA. 2006;295:172-179.