Emergency Medicine · Pulmonology
Altitude-Adjusted PERC Rule calculator
Enter the published formula inputs below to calculate and interpret this score.
Clinical inputs
Result
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0
PERC negative (altitude-adjusted)
Band: PERC negative (altitude-adjusted)
Interpretation. PERC negative (altitude-adjusted)
Suggested management. No PERC criteria; PE may be ruled out when combined with low gestalt.
Altitude-Adjusted PERC Rule: 0 — PERC negative (altitude-adjusted). Interpretation: PERC negative (altitude-adjusted) What to do: No PERC criteria; PE may be ruled out when combined with low gestalt. Inputs: Age ≥50 years: false; Heart rate ≥100: false; SpO₂ <90%: false; Unilateral leg swelling: false; Hemoptysis: false; Recent surgery or trauma: false; Prior VTE: false; Exogenous estrogen: false Source: Anstett D et al. Impact of altitude-adjusted hypoxia on the Pulmonary Embolism Rule-out Criteria. Am J Emerg Med. DOI: 10.1016/j.ajem.2018.05.063. PMID: 29848460. Scope: PERC eight criteria with hypoxia redefined as SpO₂ <90% (vs <95% at sea level) for high-altitude application; any criterion positive = PERC-positive. Base PERC: Kline JA et al. J Thromb Haemost 2008. (2019)
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Clinical inputs
- Age ≥50 years
- Heart rate ≥100
- SpO₂ <90%
- Unilateral leg swelling
- Hemoptysis
- Recent surgery or trauma
- Prior VTE
- Exogenous estrogen
Primary source
Anstett D et al. Impact of altitude-adjusted hypoxia on the Pulmonary Embolism Rule-out Criteria. Am J Emerg Med. DOI: 10.1016/j.ajem.2018.05.063. PMID: 29848460. Scope: PERC eight criteria with hypoxia redefined as SpO₂ <90% (vs <95% at sea level) for high-altitude application; any criterion positive = PERC-positive. Base PERC: Kline JA et al. J Thromb Haemost 2008. (2019)
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