Galen eCalcs - Calculator: Wells Score (DVT Risk)

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Wells Score - Deep Vein Thrombosis Risk.JPG


The Wells Score is designed to assess a patient’s probability of having deep vein thrombosis (DVT).

In those with suspected DVT, a clinical assessment of probability can be useful to determine which tests to perform.

Those with Wells scores of two or more have a 28% chance of having DVT, those with a lower score have 6% odds. Alternatively, Wells scores can be categorized as high if greater than two, moderate if one or two, and low if less than one, with likelihoods of 53%, 17%, and 5% respectively.

Wells Score Criteria Description Points
Active Cancer (treatment within last 6 months or palliative) +1 point
Calf swelling ≥ 3 cm compared to asymptomatic calf (measured 10 cm below tibial tuberosity) +1 point
Swollen unilateral superficial veins (non-varicose, in symptomatic leg) +1 point
Unilateral pitting edema (in symptomatic leg) +1 point
Previous documented DVT +1 point
Swelling of entire leg +1 point
Localized tenderness along the deep venous system +1 point
Paralysis, paresis, or recent cast immobilization of lower extremities +1 point
Recently bedridden ≥ 3 days, or major surgery requiring regional or general anesthetic in the past 12 weeks +1 point
Alternative diagnosis at least as likely −2 points

Calculator Search/Filter Keywords

At the calculator level, eCalcs comes delivered with default keywords that can be leveraged in the "Search/Filter" field to enable Specialty or System driven calculator searching. The following calculator keywords are delivered by default for the Wells Score (DVT Risk) calculator:


  • Cardiology
  • Critical Care
  • Family Practice
  • Gerontology
  • Hematology
  • Internal Medicine
  • Neurology
  • Oncology
  • Orthopedics
  • Surgery
  • Vascular


  • Cardiovascular
  • Lymphatic

Calculator Inputs

This calculator does not use any default mappings, all items require manual input.

Calculator Outputs

Output Mapping Type Description
Wells DVT Score Result Score from Wells’ criteria for Deep Vein Thrombosis
DVT Risk Result Risk of Deep Vein Thrombosis based on Wells’ score