Emergency Medicine · Pulmonology
PERC Rule calculator
Enter the published formula inputs below to calculate and interpret this score.
Clinical inputs
Result
0
PERC negative (0 criteria)
In a patient already judged to have low pretest probability, PERC is negative and no further PE testing is generally needed.
Formula inputs
- Age ≥50 years
- Pulse ≥100/min
- Oxygen saturation <95% on room air
- Unilateral leg swelling
- Hemoptysis
- Surgery or trauma within the previous 4 weeks
- Previous DVT or pulmonary embolism
- Exogenous estrogen use
Primary source
Kline JA et al. Prospective multicenter evaluation of the pulmonary embolism rule-out criteria. J Thromb Haemost (2008)
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