When a patient receives a positive test result from a diagnostic test they assume they have the disease. However, the positive
predictive value (PPV), ie the probability that they have the disease given a positive test result, is rarely equal to one.
To assist their patients, doctors must explain the chance that they do in fact have the disease. However, physicians frequently
miscalculate the PPV
... [Show full abstract] as the sensitivity and/or misinterpret the PPV, which results in increased anxiety in patients and generates
unnecessary tests and consultations. The reasons for this miscalculation as well as three ways to calculate the PPV are reviewed
here.