Calc Function

    • Calcs that help predict probability of a diseaseDiagnosis
    • Subcategory of 'Diagnosis' designed to be very sensitiveRule Out
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    PERC Rule for Pulmonary Embolism

    Rules out PE if no criteria are present and pre-test probability is ≤15%.
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    Management

    • In the setting of a low-risk patient who is not PERC negative, the physician should consider a d-dimer for further evaluation.
    • If the d-dimer is negative, and clinical gestalt determines a pre-test probability is <15% then, the patient does not require further testing for PE.
    • If the d-dimer is positive, further testing such as a CT-angiography or V/Q scan should be pursued.

    Critical Actions

    • There is no need to apply the PERC rule to those patients who are not being evaluated for PE.
    • If the patient is considered low-risk, PERC may help avoid further testing.
    • If the patient is moderate or high risk then PERC can not be utilized. Consider d-dimer or imaging based on risk.
    • Consider pericardial disease in patients with pleuritic complaints as well.
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