positive predictive value

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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 ?
Furthermore, with no prior knowledge of bioterrorism events, adequate numerator for the occurrence of any bioterrorism-related syndrome, or denominator for the population susceptible to the event, calculating the sensitivity and predictive value positive for the system was difficult.
The models were tested with the remaining data, and measures of sensitivity, specificity, and predictive value positive were extrapolated to the entire cohort (9).
Using for comparison the extrapolated number of postpartum infections among patients identified by automated code screening, plus all verified infections identified by either prospective inpatient surveillance or self-reported questionnaire screening, we determined the sensitivity of ambulatory code screening for identifying patients with postpartum infections to be 96% (95% CI 92%, 99%), specificity to be 99% (95% CI 99%, 100%%), and predictive value positive to be 40% (95% CI 35%, 45%%).
20 yielded an expected sensitivity of 87% (95% CI 72%, 94%), specificity of 97% (95% CI 96%, 98%), and predictive value positive of 55% (95% CI 41%, 68%).
The most useful screening criterion (sensitivity of 89% and predictive value positive of 30%) was dispensing of two or more TB drugs.