Pulmonology Free

PERC Rule

Rules out PE without further testing.

Enter Values

Age >=50

Heart Rate >=100

O2 Sat <95%

Hemoptysis

Estrogen Use

Prior DVT/PE

Surgery/Trauma (past 4 weeks)

Unilateral Leg Swelling

Score

Author Jeffrey A. Kline et al.

First Published 2004

Evidence Externally validated

Category Pulmonology

Original Study Clinical criteria to prevent unnecessary diagnostic testing in ED patients with suspected PE (J Thromb Haemost, 2004)

About The PERC rule identifies adults with very low clinical probability of PE in whom further testing is not needed if all 8 criteria are negative.

Clinical Use Use only when clinical gestalt is already low risk (<15%). Do not apply if pretest probability is moderate or high.