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The PERC rule is used to rule out pulmonary embolism in those patients where the clinical gestalt is that they are low risk (ie <15% risk of pulmonary embolism).
Pulmonary embolism can be ruled out if none of the following features are identified:
Age ≥50 years
Heart rate ≥100 bpm
Oxygen saturation <95%
Hemoptysis
Estrogen use
Prior DVT or PE
Unilateral leg swelling
Surgery/trauma within the previous four weeks
In patients with a low pre-test probability of PE who meet any of these criteria, further testing could be considered to more definitely rule out pulmonary embolism.
References
Kline JA et al
Prospective multicenter evaluation of the pulmonary embolism rule-out criteria.
J Thromb Haemost. 2008 May;6(5):772-80. doi: 10.1111/j.1538-7836.2008.02944.x. Epub 2008 Mar 3.
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