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Wells' Criteria for Assessment of Pretest Probability for Pulmonary Embolism:

Wells' Criteria for Assessment of Pretest Probability for Pulmonary Embolism
Suspected DVT
An alternative diagnosis is less likely than PE
Heart rate >100 beats per minute
Immobilization or surgery in the previous four weeks
Previous DVT or PE
Hemoptysis
Malignancy (on treatment, treated in the past six months or palliative)
Score
Mean probability of PE
Interpretation of risk

*Values represent point estimates with 95% confidence intervals in parentheses
V/Q Scan Result
Clinical Suspicion for PE*
High (80% to 100%) Moderate (20% to 79%) Low (0% to 19%)
High 96 (82-99) 88 (78-94) 56 (21-56)
Intermediate 66 (49-80) 28 (22-34) 16 (8-27)
Low 40 (16-68) 16 (11-22) 4 (1-11)
Normal 0 (0-52) 6 (2-16) 2 (0-9)

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