Calculators/Cardiology & Vascular/Wells Criteria for DVT & Pulmonary Embolism (with Age-Adjusted D-Dimer)

Cardiology & VascularEvidence-Based Golden Standard

Wells Criteria for DVT & Pulmonary Embolism (with Age-Adjusted D-Dimer)

Clinical pre-test probability scoring for Deep Vein Thrombosis (DVT) and Pulmonary Embolism (PE), integrated with Age-Adjusted D-Dimer guidance (ADJUST-PE) to safely avoid unnecessary CT imaging.

Wells DVT: Score -2 to 8 (Low ≤ 0, Moderate 1-2, High ≥ 3) Wells PE: Score 0 to 12.5 (Unlikely ≤ 4, Likely > 4) Age-Adjusted D-Dimer Cutoff (Age > 50) = Age × 10 µg/L FEU

Published Clinical Benchmark Cases

Clinical Parameters & Inputs

Assessment Protocol

Patient Age (years, for Age-Adjusted D-Dimer)

Clinical signs and symptoms of DVT (leg swelling, tenderness)? [+3.0]

PE is #1 diagnosis OR equally likely as other differential diagnoses? [+3.0]

Tachycardia with Heart Rate > 100 beats per minute? [+1.5]

Bedridden ≥ 3 consecutive days OR major surgery in past 4 weeks? [+1.5]

Previous documented DVT or PE? [+1.5]

Hemoptysis? [+1.0]

Active cancer (treated within 6 months or palliative)? [+1.0]

Computed OutputPE Likely (Score 4.5 > 4.0)

4.5points

Diagnostic Interpretation

Wells PE Score is 4.5 (PE Likely). D-Dimer testing is NOT recommended as a negative result cannot safely rule out PE in high-pretest probability. Immediate CT Pulmonary Angiography (CTPA) or V/Q scan is indicated. If hemodynamic instability / shock is present, initiate immediate empiric anticoagulation and bedside echocardiography.

Calculation Breakdown

Total Wells PE Score

Sum of selected clinical criteria =4.5 points

Age-Adjusted D-Dimer Threshold

65 × 10 =650 µg/L FEU

ADJUST-PE validated criteria prevents unnecessary CT radiation in elderly patients.

Clinical Decision Pearls

The 2-tier Wells system (≤ 4 = Unlikely, > 4 = Likely) combined with age-adjusted D-dimer safely reduces CT scans by ~20% without increasing missed thromboembolic events.
Never order D-dimer if clinical score is "PE Likely" (> 4), as pre-test probability is too high for a normal result to exclude clot.

Limitations & Confounders

Unreliable in pregnancy, active severe COVID-19, or post-surgical inpatients with baseline inflammatory D-dimer elevation.

Evidence & Citations

Wells PS, et al. Derivation of a simple clinical model to categorize patients probability of pulmonary embolism. Thromb Haemost. 2000;83(3):416-420.
Righini M, et al. Age-adjusted D-dimer cutoff levels to rule out pulmonary embolism: the ADJUST-PE study. JAMA. 2014;311(11):1117-1124.