Wells Score Calculator (Pulmonary Embolism)
Wells PE score — pretest probability for pulmonary embolism. Wells 2000 Annals Intern Med (modified).
Result
Wells PE score
0.0
Low pretest probability (~3%). Dichot: PE unlikely (≤4). D-dimer (or PERC rule out); if negative, PE excluded.
- DVT signs (+3)0
- PE most likely (+3)0
- HR > 100 (+1.5)0
- Immobile / surgery (+1.5)0
- Prior DVT/PE (+1.5)0
- Hemoptysis (+1)0
- Malignancy (+1)0
- Total0.0
- Three-tier riskLow pretest probability (~3%)
- Dichotomized (>4 = likely)PE unlikely (≤4)
- WorkupD-dimer (or PERC rule out); if negative, PE excluded.
Step-by-step
- Sum: 3+3+1.5+1.5+1.5+1+1 max = 12.5.
- Score = 0 + 0 + 0 + 0 + 0 + 0 + 0 = 0.0.
- Tier: Low pretest probability (~3%). Workup: D-dimer (or PERC rule out); if negative, PE excluded.
How to use this calculator
- Answer 7 yes/no clinical questions.
- Read score + risk tier.
- Low/moderate: D-dimer; high: CTPA without D-dimer.
About this calculator
Wells score for PE pretest probability. Source: Wells PS et al., "Derivation of a simple clinical model to categorize patients' probability of pulmonary embolism: increasing the model's utility with the SimpliRED D-dimer." Thromb Haemost 2000;83(3):416-20. Three-tier interpretation: ≤2 low (~3% PE), 2-6 moderate (~16%), >6 high (~40%). Dichotomized (Wells 2001): ≤4 PE unlikely, >4 PE likely — combined with D-dimer to exclude PE in the unlikely group. Also see PERC rule (Kline 2008) for very-low-risk patients. **Not medical advice — clinical judgment + imaging required.**
Frequently asked
Wells PS et al., Thromb Haemost 2000;83:416-20 (3-tier original); refinement in Ann Intern Med 2001;135:98-107 (dichotomized).
Related calculators
CHA₂DS₂-VASc Score Calculator (Stroke Risk in AF)
Stroke-risk score in non-valvular atrial fibrillation. Lip 2010 Chest. ESC/AHA recommend OAC if score ≥2 (men) / ≥3 (women).
CURB-65 Calculator (Pneumonia Severity)
CURB-65 = Confusion + Urea>7 + RR≥30 + BP<90/60 + Age≥65. Lim 2003 Thorax. Predicts 30-day pneumonia mortality.
MELD-Na Score Calculator (Liver Allocation)
MELD-Na = MELD + 1.32 × (137 − Na) − [0.033 × MELD × (137 − Na)]. UNOS 2016 update; Kim 2008 NEJM.
eGFR (CKD-EPI 2021, race-free) Calculator
eGFR from creatinine, age, sex per CKD-EPI 2021 (Inker et al., NEJM). Race-free formula adopted by NKF/ASN.
Framingham 10-Year CVD Risk Calculator
10-year general cardiovascular disease risk per D'Agostino 2008 Circulation. Sex-specific, lab-based.
LDL Cholesterol (Friedewald) Calculator
LDL = TC − HDL − TG/5 (mg/dL). Friedewald 1972 Clin Chem. Not valid if triglycerides > 400 mg/dL.