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Calcimator

Wells Score for PE Calculator

Calculate the Wells score for pulmonary embolism (PE) probability using clinical prediction criteria.

Inputs

Results

Wells Score

0pts

Risk (3-Tier)

1(1=Low, 2=Moderate, 3=High)

PE Prevalence1.3%
PE Likely (2-Tier)0(0=Unlikely, 1=Likely)
How to Use This Calculator
  1. Enter 0 or 1 for each Wells PE criterion (DVT signs, HR > 100, immobilization, prior DVT/PE, hemoptysis, malignancy, PE most likely).
  2. Review Wells PE Score and pre-test probability — use to guide CTPA vs. D-dimer decision.
  3. Score ≤ 4 with negative D-dimer has high negative predictive value for PE.

What each input means

Clinical Signs of DVT
Leg swelling and pain with palpation of deep veins (+3 points).
PE Most Likely Diagnosis
PE is the most likely or equally likely diagnosis (+3 points).
Heart Rate > 100 bpm
Tachycardia with heart rate exceeding 100 bpm (+1.5 points).
Immobilization / Surgery
Immobilization >=3 days or surgery in past 4 weeks (+1.5 points).
Previous DVT/PE
Previously objectively diagnosed DVT or PE (+1.5 points).
Hemoptysis
Coughing up blood (+1 point).
Malignancy
Treatment within 6 months or palliative care (+1 point).

How this is calculated

Worked example, using the default values

  1. Identify Input Parameters
    4 parameters
    Clinical Signs of DVT = 0, PE Most Likely Diagnosis = 0, Heart Rate > 100 bpm = 0, Immobilization / Surgery = 0 = 7 input(s) provided
  2. Calculate Wells Score
    Wells Score
    0 = 0
  3. Calculate Risk
    Risk
    1 = 1
  4. Calculate PE Prevalence
    PE Prevalence
    1.3 = 1.3%
  5. Calculate PE Likely
    PE Likely
    0 = 0

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