Wells' Criteria for DVT

Wells Score0pts

Risk CategoryLow~5%

Low to Moderate clinical suspicion.

Pre-Test Probability

About this calculator

Overview

Wells’ Criteria is a validated scoring system used to stratify the pre-test probability of Deep Vein Thrombosis (DVT) in symptomatic patients. It helps clinicians decide whether to pursue further testing like D-dimer or venous duplex ultrasound.

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Pro Tips

Alternative diagnosis: If a diagnosis at least as likely as DVT is suspected (e.g., cellulitis, Baker's cyst, calf strain), subtract 2 points.
Malignancy: Includes patients currently receiving treatment or treated within the last 6 months.
A D-dimer test is often used alongside Wells' score to 'rule out' DVT in low-risk patients.

Fun Facts

"A score of 0 or less indicates a low probability (~5%)."
"A score of 3 or higher indicates a high probability (~53%)."
"Calf swelling should be measured 10cm below the tibial tuberosity."
"The criteria were developed by Dr. Philip S. Wells in 1997."

Formula: Points are assigned based on clinical signs and history. Score ranges from -2 to 9.