Posterior Probability of Disease Calculator

Instructions: Enter parameters in the Red cells. Answer will appear in the blue cell.

LR(test result) = Likelihood Ratio of the test result.

    LR(test result)
    Probability of result in patient WITH the disease(>= 0.0 and <= 1.0, e.g. 0.95)
    Probability of result in patient WITHOUT the disease(>= 0.0 and <= 1.0, e.g. 0.01)
    LR(test result)95.000
    Post-Test Probability
    Pre-Test Probability0.012 (Pre-Test Odds)
    LR (test result)95.0001.154 (Post-Test Odds)
    Post-Test0.536

    Software utilities by Michael Kohn (makohn@mkanders.com) and Mike Jarrett (mike.jarrett@quesgen.com)

    Disclaimer: Software is provided on an as-is basis and no warranty is made of any kind. Calculations are believed accurate but should be verified by the user