The Pulmonary Embolism Rule-out Criteria (PERC) helps clinicians rule out PE in patients with low clinical suspicion (<15% pre-test probability).
Total PERC Score:
3 points
0
The PERC rule is a clinical decision tool consisting of 8 specific criteria. Each positive finding adds 1 point to the total score.
Formula: Score = Σ(Criteria present)
Score = Σ(Criteria present)
A 55-year-old patient presents with a Heart Rate of 105 bpm and no other findings.
It is used to safely avoid unnecessary testing like D-dimer or CT scans in patients whose pre-test probability of PE is already very low (<15%).
No, it simply means the rule-out criteria were not met and the clinician should proceed with standard diagnostic pathways, such as a D-dimer test.
Patients with a moderate or high clinical suspicion of PE should proceed directly to diagnostic imaging regardless of their PERC score.
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