Epidemiology & Screening · NEET PG Preparation Community Medicine (PSM)
If the prevalence of a disease in a population increases, what happens to the Positive Predictive Value (PPV) of a screening test with constant sensi…
Practice question from Epidemiology & Screening (NEET PG Preparation Community Medicine (PSM)), with the correct answer and a step-by-step solution.
hard · MCQ · Q-8DF157
If the prevalence of a disease in a population increases, what happens to the Positive Predictive Value (PPV) of a screening test with constant sensitivity and specificity?
- A.PPV increasesCorrect answer
- B.PPV decreases
- C.PPV remains unchanged
- D.PPV becomes equal to specificity
Solution
Predictive values depend heavily on the prevalence of the disease in the population. As disease prevalence increases, the proportion of true positives among all test positives increases, thereby increasing the Positive Predictive Value (PPV). Conversely, Negative Predictive Value (NPV) decreases.
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