PERC Rule for the Assessment of Possible Pulmonary Embolism

 

		Age ≥50 years old (1 point)
		Heart rate ≥100 beats per minute (1 point)
		Arterial oxygen saturation less than 95% (1 point)
		Swelling of a single leg (1 point)
		Hemoptysis (1 point)
		History of recent surgery or trauma (1 point)
		History of venous thromboembolic disease: DVT or PE (1 point)
		Use of estrogen hormone (1 point)

 
Important: Inputs must be complete to perform calculation.

 

Total Criteria Point Count:
 

 

PERC Score Interpretation

 

0 points:	Low risk of pulmonary embolism
1 to 8 points:	Increased risk of pulmonary embolism

 

Notes

• PERC: Pulmonary Embolism Rule-out Criteria.

 

References

1. Kline JA, Mitchell AM, Kabrhel C, Richman PB, Courtney DM. Clinical criteria to prevent unnecessary diagnostic testing in emergency department patients with suspected pulmonary embolism. J Thromb Haemost. 2004 Aug;2(8):1247-55. PubMed ID: 15304025