PERC Rule Calculator

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PERC Rule
Clinical Decision Tool

Apply the eight Pulmonary Embolism Rule-out Criteria in adults with a clinician-assessed low pretest probability of pulmonary embolism.

PERC Eligibility PERC is a rule-out tool for patients whose pretest probability of pulmonary embolism is already low. Used by PERC Rule Clinical note Do not use PERC as a standalone screening test or in patients with moderate or high clinical probability. Reference Kline JA et al. Prospective multicentre evaluation of PERC. Learn more →
PERC should only be used after a clinician has judged pulmonary embolism to be low probability.
Select Yes when the patient is aged 50 years or older.
Select Yes when the measured heart rate is at least 100 beats per minute.
Select Yes when room-air oxygen saturation is below 95%.
Select Yes when unilateral leg swelling is present.
Select Yes when the patient has haemoptysis.
Select Yes for surgery or trauma requiring hospitalisation within the previous four weeks.
Select Yes for any previous deep-vein thrombosis or pulmonary embolism.
Select Yes when the patient is currently using exogenous oestrogen.
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