# Positive predictive value

## Positive predictive value is how convincing or believable a positive test result is in a given population

The positive predictive value (PPV) of a test relates to

**how believable a positive test is within a given population**. As the**of a disease state increases, the positive predictive value of a diagnostic test will increase due to the existence of more cases being picked up in the population.**__prevalence__For positive predictive value, researchers focus on this part of the 2x2 table:

Everyone in the calculation tested "positive" using our diagnostic test. Thus, researchers can calculate proportion of people with the disease as measured by "

**gold standard**" that tested "positive" using our test. With**higher values of PPV**, the "**believability**" or confidence of the test increases.Here is the formula for positive predictive value:

**Positive Predictive Value (PPV)**

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