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Calculators / Pulmonology & Critical Care / PERC Rule

PERC Rule

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

Age ≥ 50 years *

Step 1 of 7

Heart Rate ≥ 100 bpm *

Step 2 of 7

O₂ Saturation < 95% on room air *

Step 3 of 7

Unilateral Leg Swelling *

Step 4 of 7

Hemoptysis (coughing blood) *

Step 5 of 7

Recent Surgery or Trauma (within 4 weeks) *

Step 6 of 7

Hormone Use (OCP, HRT, etc.) *

Step 7 of 7


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