PERC Rule (Pulmonary Embolism Rule-Out Criteria)

Identifies low-risk patients for whom PE is sufficiently unlikely that no testing (including D-dimer) is needed. Use after gestalt pre-test probability assessment.

Age >= 50 years *

Age >= 50 years

Heart Rate >= 100 bpm *

Heart Rate >= 100 bpm

O2 Saturation on Room Air < 95% *

O2 Saturation on Room Air < 95%

Unilateral Leg Swelling *

Unilateral Leg Swelling

Hemoptysis *

Hemoptysis

Recent Surgery or Trauma *

Recent Surgery or Trauma

Surgery or trauma requiring hospitalization within last 4 weeks

Prior DVT or PE *

Prior DVT or PE

Hormone Use *

Hormone Use

Oral contraceptives, hormone replacement, or estrogenic hormones

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