NCI Dictionary of Genetics Terms

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Welcome to the NCI Dictionary of Genetics Terms, which contains technical definitions for more than 150 terms related to genetics. These definitions were developed by the PDQ® Cancer Genetics Editorial Board to support the evidence-based, peer-reviewed PDQ cancer genetics information summaries.

positive predictive value
(PAH-zih-tiv preh-DIK-tiv VAL-yoo)
The likelihood that an individual with a positive test result truly has the particular gene and/or disease in question. Also called PPV.