Printed on 2/13/2026
For informational purposes only. This is not medical advice.
The Wells Score for DVT is a clinical prediction rule that estimates the pre-test probability of deep vein thrombosis based on clinical signs, symptoms, and risk factors. It helps clinicians determine which patients need further testing (ultrasound, D-dimer) and which can be safely ruled out without imaging.
Formula: Wells DVT Score = sum of clinical criteria (range: −2 to 9)
Disclaimer: This tool is for educational and informational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider with questions about your health.
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It is a clinical prediction rule that assigns points based on signs, symptoms, and risk factors to estimate the likelihood of DVT. The score ranges from −2 to 9 and categorizes patients into low (≤0), moderate (1–2), or high (≥3) probability groups.
Low probability: check D-dimer — if negative, DVT is effectively ruled out. Moderate probability: D-dimer or ultrasound. High probability: proceed directly to compression ultrasound regardless of D-dimer. Clinical judgment should always supplement the score.
D-dimer is a blood test that measures a protein fragment produced when blood clots dissolve. A negative D-dimer in a low-risk patient effectively rules out DVT (high negative predictive value). However, D-dimer can be elevated in many conditions and has low specificity.
Common symptoms include unilateral leg swelling, pain or tenderness (especially in the calf), warmth, redness, and visible superficial veins. However, DVT can also be asymptomatic. Risk factors include recent surgery, immobilization, cancer, obesity, and hormonal therapy.