Wells Clinical Prediction Rule for DVT:

  1. Active Cancer (treatment ongoing or within previous 6 months)
  2. Paralysis, paresis or recent plaster immobilization of the LE
  3. Recently bedridden for 3 days or more, or major surgery within the previous 12 weeks requiring anesthesia
  4. Localized tenderness along the distribution of the deep venous system
  5. Entire leg swelling
  6. Calf Swelling at least 3cm larger than asymptomatic leg (measured 10cm below tibial tub)
  7. Pitting Edema confined in symptomatic leg
  8. Collateral superficial veins (nonvaricose)
  9. Previous DVT
  10. Subtract 2 if there is an alternative diagnosis at least as likely as a DVT

High Probability if score > 3
Moderate if score is 1-2
Low if score is 0
Citation:  Wells PS, Anderson DR, Bormanis J, et al. Value of assessment of pretrest probability of deep-vein thrombosis in clinical management. Lancet. 1997;350:1795-1798.


  • Do you know if this tool is in the public domain?

    Linda McAllister December 19, 2014 7:09 pm Reply
  • I learned of this test during NextGen residency 3 years ago. It has been a God send and I’ve used it for referrals back to the physician countless times. My wife is a therapist also and she uses it twice as much in her practice setting.

    Kurt McDonald February 4, 2016 11:45 pm Reply

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