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You want to rule out PE (Apply Wells criteria (Low (< 50 yo (PERC all…

- - - - PERC all fulfilled
        
        No testing required (ruled out)
      - PERC not all fulfilled
        
        D-Dimer
        
        Negative
        
        Positive
        
        CTPA or V/Q
    - - D-Dimer
        
        Negative (ruled out)
        
        Positive
        
        CTPA or V/Q