Diagnostic Post-Test Probability of Disease Calculator

Calculate Post-Test Probability of Disease

The probability of the disease before the test is performed (0-100%).
The ability of the test to correctly identify those with the disease (0-100%).
The ability of the test to correctly identify those without the disease (0-100%).

Accurately determine the post-test probability of disease with our intuitive calculator. Input pre-test probability, test sensitivity, and specificity to assess the true likelihood of a condition after a diagnostic test. Essential for clinical decision-making and interpreting medical results.

Formula:

Ppost = (Ppre × Sensitivity) / [(Ppre × Sensitivity) + ((1 - Ppre) × (1 - Specificity))]

  • Ppost: Post-test Probability of Disease
  • Ppre: Pre-test Probability of Disease
  • Sensitivity: The proportion of true positives correctly identified by the test.
  • Specificity: The proportion of true negatives correctly identified by the test.

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