Printed on 2/13/2026
For informational purposes only. This is not medical advice.
The Wells Score for PE is a clinical prediction tool that estimates the pre-test probability of pulmonary embolism. It uses clinical signs, symptoms, and risk factors to stratify patients into low, moderate, or high probability categories, guiding the clinician's decision on whether to order D-dimer testing or proceed directly to CT pulmonary angiography (CTPA).
Formula: Wells PE = DVT symptoms(3) + PE likely(3) + HR>100(1.5) + Immobilization(1.5) + Previous(1.5) + Hemoptysis(1) + Cancer(1)
Disclaimer: This tool is for educational and informational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider with questions about your health.
Calculate the Wells Score to assess the clinical probability of deep vein thrombosis (DVT). Guide diagnostic workup and D-dimer testing.
ClinicalCalculate the alveolar-arterial oxygen gradient to evaluate the cause of hypoxemia. Differentiates lung pathology from hypoventilation.
It is a clinical decision tool that estimates the probability of pulmonary embolism using seven clinical criteria. Scores can be interpreted using a three-tier model (low/moderate/high) or a two-tier model (PE unlikely ≤4, PE likely >4). It guides the choice between D-dimer testing and CT angiography.
Low risk (<2 points): D-dimer — if negative, PE effectively ruled out. Moderate risk (2–6): D-dimer, proceed to CTPA if positive. High risk (>6): proceed directly to CTPA without waiting for D-dimer.
CT Pulmonary Angiography is the gold standard imaging test for diagnosing pulmonary embolism. It uses IV contrast and CT scanning to directly visualize blood clots in the pulmonary arteries. It is fast, widely available, and has high sensitivity and specificity.
They are two separate scoring systems. The Wells DVT score has 10 criteria and evaluates deep vein thrombosis probability. The Wells PE score has 7 criteria and evaluates pulmonary embolism probability. They share some risk factors but are used for different clinical questions.