The patient had some pre-test probability of the disease in question. You did a test and obtained the result "r". This calculator gives the patient's new post-test probability of disease, given that result.
Instructions: Enter parameters in the red cells. Answer will appear in the blue cell.
Pre-Test Odds = P/(1 - P) = 0.012
Post-Test Odds = Pre-Test Odds * LR(r) = 1.215
Post-Test Probability = Post-Test Odds/(1 + Post-Test Odds) = 0.548