positive predictive value

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Related to positive predictive value: Odds ratio, Likelihood ratio

positive predictive value

Statistics The number of true positives divided by the sum of true positives–TP and false positives–FP, a value representing the proportion of subjects with a positive test result who actually have the disease, aka 'efficiency' of a test. Cf Negative predictive value, ROC–receiver operating characteristic.

pos·i·tive pre·dic·tive val·ue

(poz'i-tiv prĕ-dik'tiv val'yū)
The probability that a positive result accurately indicates that the analyte or the specific disease is present.

Positive predictive value (PPV)

The probability that a person with a positive test result has, or will get, the disease.
Mentioned in: Genetic Testing

predictive value

a measure used by clinicians to interpret diagnostic test results. See also sensitivity, specificity.

positive predictive value
the probability that a patient with a positive test result really does have the condition for which the test was conducted.
negative predictive value
the probability that a patient with a negative test result really is free of the condition for which the test was conducted.
References in periodicals archive ?
During the 12-month surveillance period, no patients who had respiratory symptoms but no pulmonary parenchymal involvement were positive for MERS-CoV by PCR, and the positive predictive value of signs and symptoms increased with the severity of clinical manifestation.
Like positive predictive value, negative predictive value depends on the validity of the screening test and the prevalence of the disorder.
In particular, the use of four key concepts used for judging the quality of evidence in medical diagnosis--sensitivity, specificity, positive predictive value, and negative predictive value--are relevant to the assessment of environmental hazards, especially those that have low probabilities of occurrence.
Similarly, an improvement in positive predictive value was noted when compared with that of conventional criteria (70% to 100% vs 56% with conventional criteria).
NEW YORK -- A combination of four readily available clinical and psychosocial tests can predict whether patients are at risk for converting to psychosis with fair to good positive predictive value, an investigator asserts.
As a result, the test's positive predictive value for rheumatoid arthritis is a mere 24%, although its negative predictive value is much better at 89%.
However, the positive predictive value increased and the detection of 64 women with CIN2 and CIN 3 prevented development of serious invasive cancers.
In the study, reported in The New England Journal of Medicine for October 16 and released ahead of print, the sensitivity, specificity, and positive predictive value for the two reading protocols was nearly the same.
Local health departments reported local outbreaks with higher sensitivity and positive predictive value than did AODAs.
5%)false positive, 5 (8%)false negatives, 8 (13%) true negatives, and 46 (77%) true positives with 90% sensitivity, 89% specificity, 98% positive predictive value, 62% negative predictive value, and 90% overall accuracy.
Objective: We sought to calculate the sensitivity, specificity, negative predictive value, and positive predictive value of a limited sinus computed tomographic (CT) scan for sinus disease.
The researchers determined the positive predictive value of abnormal urinalysis to be 41% and the negative predictive value to be 76%.

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