PE RULES
Perc Rule:
The PERC rule is for patients where the diagnosis of PE is being considered but are felt to be low-risk.
Criteria:
Age ≥50
HR ≥100
O₂ sat on room air <95%
Unilateral leg swelling
Hemoptysis
Recent surgery or trauma
Surgery or trauma ≤4 weeks ago
Prior PE or DVT
Hormone use
Oral contraceptives
If all of these are negative then the patient has a less than 2% risk of PE and may not need a study.
Wells’ Criteria for Pulmonary Embolism
Criteria:
Clinical signs and symptoms of DVT
PE is #1 diagnosis OR equally likely
Heart rate > 100
Immobilization at least 3 days OR surgery in the previous 4 weeks
Previous, objectively diagnosed PE or DVT
Hemoptysis
Malignancy w/ treatment within 6 months
If all negative then <1.6% chance of PE
