Term: Positive Predictive Value (PPV)

Glossary Definition

Last Updated: 2006-10-20


The positive predictive value of a test is the probability that the patient/subject has the disease/condition when restricted to those patients/subjects who test positive. This term is sometimes abbreviated as PPV. You can compute the positive predictive value as PPV = TP / (TP + FP) where TP and FP are the number of true positive and false positive results, respectively. Notice that the denominator for positive predictive value is the number of patients/subjects who test positive.

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