Wells Score PE Calculator
Estimate pre-test probability of pulmonary embolism using the Wells criteria. Enter values for instant results with step-by-step formulas.
Formula
Wells PE Score = Sum of clinical criteria points (range: 0 to 12.5)
Points are assigned based on clinical criteria. DVT signs and PE as #1 diagnosis carry the highest weight (3 points each). The score determines pre-test probability and guides diagnostic strategy. Two-tier model: ≤4 (PE unlikely, use D-dimer) vs. >4 (PE likely, proceed to CTPA).
Worked Examples
Example 1: Low Probability PE
Problem: 35-year-old with pleuritic chest pain, HR 88, no risk factors.
Solution: No criteria met\nTotal Wells = 0\nProbability: Low (~1.3%)\nWorkup: D-dimer (consider PERC first)
Result: Wells 0 — Low Probability, D-dimer to exclude
Example 2: High Probability PE
Problem: Post-surgical patient with acute dyspnea, HR 110, DVT signs, hemoptysis.
Solution: DVT signs: +3\nPE #1 diagnosis: +3\nHR >100: +1.5\nImmobilization/surgery: +1.5\nHemoptysis: +1\nTotal Wells = 10\nProbability: High (~40.6%)\nWorkup: CTPA immediately
Result: Wells 10 — High Probability, CTPA and empiric anticoagulation
Frequently Asked Questions
What is the Wells score for PE?
The Wells score for pulmonary embolism is a validated clinical prediction rule that estimates the pre-test probability of PE. It assigns points based on clinical findings and risk factors, producing a score that stratifies patients into probability categories. The original three-tier model divides patients into low (<2), moderate (2-6), and high (>6) probability. The simplified two-tier model uses a cutoff of 4: PE unlikely (≤4) vs. PE likely (>4).
What is the two-tier vs. three-tier Wells model?
The three-tier model stratifies into low (0-1), moderate (2-6), and high (>6) probability with PE prevalences of ~1.3%, ~16.2%, and ~40.6% respectively. The two-tier (dichotomized) model uses a cutoff of 4: PE unlikely (≤4, prevalence ~8%) vs. PE likely (>4, prevalence ~34%). The two-tier model is simpler and commonly used with D-dimer testing to safely exclude PE in the 'unlikely' group.
What formula does Wells Score PE Calculator use?
The formula used is described in the Formula section on this page. It is based on widely accepted standards in the relevant field. If you need a specific reference or citation, the References section provides links to authoritative sources.
Is my data stored or sent to a server?
No. All calculations run entirely in your browser using JavaScript. No data you enter is ever transmitted to any server or stored anywhere. Your inputs remain completely private.
How accurate are the results from Wells Score PE Calculator?
All calculations use established mathematical formulas and are performed with high-precision arithmetic. Results are accurate to the precision shown. For critical decisions in finance, medicine, or engineering, always verify results with a qualified professional.
How do I get the most accurate result?
Enter values as precisely as possible using the correct units for each field. Check that you have selected the right unit (e.g. kilograms vs pounds, meters vs feet) before calculating. Rounding inputs early can reduce output precision.