Positive predictive value
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At the time the article was created Ayush Goel had no recorded disclosures.View Ayush Goel's current disclosures
At the time the article was last revised Daniel J Bell had no financial relationships to ineligible companies to disclose.View Daniel J Bell's current disclosures
Positive predictive value of a test/investigation is defined as the proportion of patients with positive results being truly diseased.
Positive predictive value = true positives (TP) detected / total positive results
(total positive results = true positive (TP) + false positive (FP)
One can also determine the PPV with an estimate of sensitivity, specificity, and pretest probability (p).
PPV = [(sensitivity) x (p)] / [sensitivity x (p) + (1 - specificity) x (1 - p)]
- unlike sensitivity and specificity, PPV is highly dependent on the prevalence of the disease in the target population
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