Wells Score for Deep Vein Thrombosis (DVT) | Online Free Tool | Elysia Tools
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Wells Score for Deep Vein Thrombosis (DVT)
Calculate the Wells score to estimate clinical probability of deep vein thrombosis (DVT). Components: active cancer (+1), paralysis/paresis/recent plaster immobilization (+1), recently bedridden ≥3 days or major surgery ≤12 weeks (+1), localized tenderness along deep veins (+1), entire leg swollen (+1), calf swelling ≥3 cm vs other leg (+1), pitting edema confined to symptomatic leg (+1), collateral superficial (nonvaricose) veins (+1), previously documented DVT (+1), alternative diagnosis at least as likely as DVT (−2). Reports BOTH interpretations: three-tier (low ≤0 ~5%, moderate 1–2 ~17%, high ≥3 ~17–53%) and dichotomized two-tier (DVT unlikely ≤1 — a negative D-dimer rules out; DVT likely ≥2 — ultrasound/D-dimer). Derived from Wells 1997 (Lancet) and the Goodacre 2005 (BMJ) meta-analysis. Not medical advice.
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Key facts
Category
Health
Input types
checkbox
Output type
json
Sample coverage
4
API ready
Yes
Overview
Calculate the Wells score for suspected deep vein thrombosis (DVT) by selecting applicable clinical findings. The tool returns the total score with both three-tier and two-tier interpretations. It is a clinical prediction rule and not medical advice.
When to use
Estimate the clinical probability of DVT from documented symptoms and risk factors.
Review how individual findings contribute positive or negative points to the Wells score.
Compare the three-tier result with the two-tier interpretation for DVT likelihood.
How it works
1Select each applicable Wells criterion, including cancer, immobilization, recent surgery, swelling, tenderness, previous DVT, or an alternative diagnosis.
2The tool adds 1 point for each positive criterion and subtracts 2 points when an alternative diagnosis is at least as likely as DVT.
3It returns the total Wells score in JSON format.
4The result reports three-tier risk categories and the two-tier classification of DVT unlikely or DVT likely.
Use cases
Clinicians can document the contribution of each DVT finding during an initial assessment.
Medical students can study how the Wells criteria produce low, moderate, high, unlikely, or likely classifications.
Clinical teams can use the score as one structured input when considering subsequent evaluation such as D-dimer testing or ultrasound.
Examples
1. Calf tenderness with swelling and pitting edema
Clinician
Background
A patient has localized tenderness along the deep veins, calf swelling of at least 3 cm compared with the other leg, and pitting edema confined to the symptomatic leg.
Problem
Calculate the Wells DVT score and review both interpretation systems.
How to use
Select Localized tenderness along deep veins, Calf swelling ≥ 3 cm vs other leg, and Pitting edema confined to symptomatic leg. Leave the other criteria unselected.
The total is 3. The three-tier interpretation is high, and the two-tier interpretation is DVT likely.
2. Alternative diagnosis lowers the score
Medical student
Background
A patient has deep-vein tenderness and pitting edema in the symptomatic leg, but cellulitis is considered at least as likely as DVT.
Problem
See how the alternative-diagnosis criterion changes the total score.
How to use
FAQ
What does the Wells DVT calculator measure?
It estimates the clinical probability of deep vein thrombosis using the Wells clinical prediction rule.
What findings add points to the score?
Findings include active cancer, immobilization, recent surgery or bed rest, deep-vein tenderness, leg swelling, pitting edema, collateral veins, and previous DVT.
Which finding subtracts points?
An alternative diagnosis at least as likely as DVT subtracts 2 points.
How are the scores interpreted?
Three-tier results are low at 0 or below, moderate at 1–2, and high at 3 or more. Two-tier results are DVT unlikely at 1 or below and DVT likely at 2 or more.
Does this calculator diagnose DVT?
No. It estimates clinical probability and does not replace clinical assessment or diagnostic testing.