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PERC Rule Calculator

Pulmonary embolism rule-out (8 criteria).

Compute the Pulmonary Embolism Rule-out Criteria (PERC). If a patient is low pre-test risk and meets all 8 PERC criteria (score = 0), no further PE workup is needed.

Priya Venkatesan By Priya Venkatesan
Reviewed by Dr. Helena Ortiz
Published Last reviewed 1 min read

Inputs

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

Score = sum of 8 yes/no items. PERC-negative requires the score to be 0.

In depth

Compute the Pulmonary Embolism Rule-out Criteria (PERC). If a patient is low pre-test risk and meets all 8 PERC criteria (score = 0), no further PE workup is needed.