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Rules out pulmonary embolism in patients with low clinical suspicion, avoiding D-dimer and imaging.
Age ≥ 50
HR ≥ 100 bpm
SaO2 < 95% on room air
Unilateral leg swelling
Hemoptysis
Recent surgery or trauma (within 4 weeks)
Prior PE or DVT
Oral contraceptive or hormone use
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