VITAL DX v4.0 • VERIFIED QUANTITATIVE BRIEFING
Bayesian Positive Predictive Value: 80% Sens / 84% Spec / 10% Prevalence
With 80% sensitivity, 84% specificity, and 10% disease prevalence, the Positive Predictive Value (PPV) of a positive test is 35.7%.
Bayes Theorem: PPV = TP / (TP + FP) = (80% × 10%) / [(80% × 10%) + (16% × 90%)] = 35.7%.
FAQ: What is the PPV when sensitivity is 80%, specificity is 84%, and prevalence is 10%?
The Positive Predictive Value (PPV) is 35.7%, meaning 64.3% of positive results at 10% prevalence are false positives.