Clinical tool
Wells DVT
Pre-test probability for deep vein thrombosis.
Wells DVT
0/ 9
DVT unlikely
Score below 2. D-dimer is commonly used; a negative result makes DVT unlikely without imaging.
- Three-tier reading
- Low. Score of 0 or below.
This score supports risk stratification and should be interpreted alongside the overall clinical context and current treatment guidance.
Score support, not a decision
What this calculates
Wells criteria for deep vein thrombosis: ten items giving a pre-test probability, from −2 to 9.
When to use it
In a patient with a suspected first lower limb DVT, to choose between D-dimer and ultrasound.
How to interpret it
A score of 2 or more is DVT likely. Below 2 is DVT unlikely. In the three-tier version 0 or below is low, 1 to 2 moderate and 3 or more high.
Important limitations
- Choose the more symptomatic leg when both are affected.
- It was not validated in pregnancy, suspected recurrent DVT in the same leg or hospital inpatients.
- Upper limb DVT is a different problem, and this score does not apply to it.
For practising medics only. Clinical tools support judgement, they do not replace it. Always verify results against current guidelines and the patient in front of you.