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Altitude-Adjusted PERC Rule

Step-by-step mode. Answer each question and result updates automatically.

Step 1 of 9 11%

High altitude (>4000 ft) *

Step 1 of 9

O₂ sat on room air <90% *

Step 2 of 9

Age ≥50 *

Step 3 of 9

HR ≥100 *

Step 4 of 9

Unilateral leg swelling *

Step 5 of 9

Hemoptysis *

Step 6 of 9

Recent surgery or trauma *

Step 7 of 9

Prior PE or DVT *

Step 8 of 9

Hormone use *

Step 9 of 9

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    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;2(8):1247-1255.
    Kline JA, Courtney DM, Kabrhel C, et al. Prospective multicenter evaluation of the pulmonary embolism rule-out criteria. J Thromb Haemost. 2008;6(5):772-780.
    Wolf SJ, McCubbin TR, Nordenholz KE, et al. Assessment of the pulmonary embolism rule-out criteria rule for evaluation of suspected pulmonary embolism in the emergency department. Am J Emerg Med. 2008;26(2):181-185.
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