🩸 Wells Score Calculator
Pre‑test probability for Deep Vein Thrombosis (DVT) and Pulmonary Embolism (PE)
Used daily by emergency physicians, hospitalists, and hematologists. 100% client‑side, private.
Score 1–2 → Moderate risk (approx 17%).
Score ≥ 3 → DVT likely (approx 75%).
Score > 4 → PE likely (approx 40% probability).
📖 What is the Wells Score?
The Wells score is a validated clinical prediction rule used to estimate the pre‑test probability of Deep Vein Thrombosis (DVT) and Pulmonary Embolism (PE). It helps clinicians determine the need for further diagnostic testing such as D‑dimer or imaging studies.
DVT Wells Score (modified from Wells et al., 2003): Scores range from -2 to 8. Higher scores = higher probability of DVT.
PE Wells Score (revised Geneva score often used in conjunction): Scores range from 0 to 12.5. This tool uses the original Wells criteria for PE (Wells et al., 2000).
✨ Clinical Utility
- DVT: Score ≤ 0 → DVT unlikely (proceed with D‑dimer). Score ≥ 3 → DVT likely (consider ultrasound).
- PE: Score ≤ 4 → PE unlikely (D‑dimer can safely rule out). Score > 4 → PE likely (consider CTPA or V/Q scan).
- Used daily in emergency departments, inpatient wards, and outpatient clinics.
- Validated in multiple large cohort studies.
⚠️ Important Considerations
- The Wells score should be used as part of a structured diagnostic algorithm, not as a standalone test.
- Patients with a high clinical suspicion or significant symptoms should proceed directly to diagnostic imaging regardless of score.
- D‑dimer testing is less specific in hospitalized patients, elderly, and those with cancer.
- This tool provides recommendations based on standard guidelines – clinical judgment always takes precedence.