Altitude-Adjusted PERC Rule Calculator
Clinical use note: PERC is intended only for patients with a low pre-test probability of pulmonary embolism.
This calculator is educational and should not replace clinician judgment, local protocols, or emergency assessment.
Patient Inputs
PERC Criteria
Enter values and click Calculate.
References
- Kline JA et al. Clinical criteria to prevent unnecessary diagnostic testing in emergency department patients with suspected pulmonary embolism. J Thromb Haemost. 2004.
- Kline JA et al. Prospective multicenter evaluation of the pulmonary embolism rule-out criteria. J Thromb Haemost. 2008.
- Madsen T et al. Impact of altitude-adjusted hypoxia on the Pulmonary Embolism Rule-out Criteria. Am J Emerg Med. 2019.
- AAFP. Pulmonary Embolism Rule-Out Criteria: A Clinical Decision Rule That Works — notes that PERC should be used only when pre-test probability is low.
- REBEL EM. Altitude Adjusted PERC Oxygen Saturation — discussion of high-altitude oxygen saturation cutoffs and clinical limitations.
