Suspected pulmonary embolism

1. Step 1 · Emergency Medicine

   PERC Rule for Pulmonary Embolism

   Low gestalt (< 15%) — rule out PE without testing if all criteria are absent.

   Population

   Low-risk ED patients

   Key limitation

   Invalid if gestalt is not low.

   Inputs

   9

   Open tool

2. Step 2 · Emergency Medicine

   Wells' Criteria for Pulmonary Embolism

   Structured pretest probability to choose D-dimer vs imaging.

   Population

   Suspected PE

   Key limitation

   'PE most likely' item is subjective.

   Inputs

   7

   Open tool

3. Step 3 · Emergency Medicine

   Pulmonary Embolism Severity Index (PESI)

   Confirmed PE — 30-day mortality class to guide site of care.

   Population

   Confirmed acute PE

   Key limitation

   Age-weighted.

   Inputs

   11

   Open tool

4. Step 4 · Emergency Medicine

   Simplified PESI (sPESI)

   Confirmed PE — quick low-risk identification.

   Population

   Confirmed acute PE

   Key limitation

   Binary output.

   Inputs

   6

   Open tool

The Navigator organises validated tools around a presentation. It does not recommend a diagnosis or treatment.