Wells Score Calculator (DVT)
What is Wells Score Calculator (DVT)
The Wells score estimates the pretest probability of a deep vein thrombosis from ten clinical findings. Nine of them, such as active cancer, a swollen leg or a previously documented DVT, each add a point, while an alternative diagnosis that is at least as likely subtracts two. In the widely used two-tier model, a total of 2 or more means DVT is likely and below 2 means unlikely.
How to use
- Tick each clinical criterion that applies to the patient.
- Tick the alternative diagnosis box if another cause is at least as likely, which subtracts two points.
- Read the total score as you go.
- See whether the result places DVT in the likely or unlikely group.
When to use it
A patient turns up with a swollen, tender calf and you want to structure the work-up? Tick localized tenderness, a swollen entire leg and calf swelling over 3 cm, and the score reaches 3, in the DVT-likely group that points towards imaging. In the unlikely group, a negative D-dimer can often safely rule out thrombosis without a scan.
Frequently asked questions
What does the two-tier Wells score mean?
In the two-tier model, a score of 2 or more means DVT is likely and warrants imaging, while a score below 2 means DVT is unlikely and can often be combined with a D-dimer to safely exclude it.
When do I subtract two points?
Subtract two only when an alternative diagnosis is at least as likely as DVT, for example a clear cellulitis or a ruptured Baker cyst. It is the single negative item in the score.
Does a low Wells score exclude DVT on its own?
No. A DVT-unlikely score lowers the probability but is usually paired with a D-dimer, and imaging is still needed to confirm or exclude thrombosis when suspicion remains.
Can I share this tool with my inputs pre-filled?
Yes. The URL updates automatically as you tick criteria. Copy it from the address bar or use the Copy link button, and anyone who opens the link will see your exact selections ready to go.
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