Positive Predictive Value: Meaning, Formula, and Interpretation
Jim Frost
What is Positive Predictive Value (PPV)?
Positive Predictive Value (PPV) assesses a diagnostic test’s accuracy by calculating the probability that a person who tests positive truly has the condition. PPV focuses on how trustworthy a positive result is in real-world testing scenarios. Hence, it is the best measure for interpreting an individual positive test result. Mammography, for example, is a well-known case where PPV plays a central role in understanding what a positive test result really...