PERC rule

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Background

  • Use only if you would be confident in excluding PE with a neg D-dimer
  • If all are present AND low suspicion for PE, no D-dimer needed:

PERC Rule Calculator

1. Check all of the following that are true:

Age <50yr
Pulse ox >94% (room air)
HR <100
No prior PE or DVT
No recent surgery or trauma (within prior 4wk)
No hemoptysis
No estrogen use
No unilateral leg swelling
→In patients with low suspicion for PE (best-guess pre-test probability <15%) AND all are true, only 0.9% had PE (n=7527) and it can be ruled-out without further testing (i.e. no need for d-dimer)[1][2]

Your score is 0 / 0


Validation

  • Validated on 7527 patients
    • Only 0.9% had PE when PERC negative, no deaths

See Also

Pulmonary Embolism (PE)

External Links

See Also

References

  1. ↑ Kline JA, et al. Clinical criteria to prevent unnecessary diagnostic testing in emergency department patients with suspected pulmonary embolism. J Thromb Haemost 2004; 2: 1247–55.
  2. ↑ Kline JA, et al. Prospective multicenter evaluation of the pulmonary embolism rule-out criteria. J Thromb Haemost 2008; 6: 772–80. (PMID: 18318689).
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