Quickly determine if a patient is at low risk for pulmonary embolism (PE) using our online PERC Calculator. This tool helps clinicians apply the Pulmonary Embolism Rule-Out Criteria to potentially avoid unnecessary imaging, ensuring efficient and safe patient management and reducing healthcare costs.
Formula:
The PERC (Pulmonary Embolism Rule-Out Criteria) score is not a numerical sum but a set of 8 clinical criteria used to safely rule out PE in patients with a low pretest probability. If ALL 8 criteria are negative (i.e., the patient meets all 8 PERC criteria), the PERC score is 0, and PE can be safely ruled out. If ANY ONE of the 8 criteria is positive, the PERC score is >0, and PE cannot be ruled out by PERC alone. The PERC score is typically applied to patients with a low clinical probability of PE.
The 8 PERC criteria are:
- Age < 50 years
- Heart rate < 100 beats/min
- Oxygen saturation ≥ 95% on room air
- No unilateral leg swelling
- No hemoptysis
- No recent trauma or surgery (within 4 weeks)
- No prior history of venous thromboembolism (VTE)
- No estrogen use