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.

Medical Dictionary for the Health Professions and Nursing © Farlex 2012

Positive predictive value (PPV)

The probability that a person with a positive test result has, or will get, the disease.

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References in periodicals archive ?

If the presence of an alternative diagnosis is to be used as justification for discontinuing SARS-specific isolation precautions, the alternative diagnoses should be based only upon tests with high positive predictive value, and the clinical illness should be fully explainable by the diagnosis.

Combining clinical and epidemiologic features for early recognition of SARS

Although the presence of symptoms was statistically associated with T vaginalis infection, the positive predictive value was low (0.20).

Differentiation of Gardnerella vaginalis, Candida albicans, and Trichomonas vaginalis infections of the vagina

Statistical Indices of Oval Shape Sensitivity 0% Specificity 76% Positive predictive value 0% Negative predictive value 44% Table 3.

MR imaging detected breast lesions--histopathological correlation of qualitative lesion characteristics

Prediction of Appendicitis by Modified Alvarado Score in Study Group if Score is [greater than or equal to] 7 Sensitivity 90.4% Specificity 81.25% Positive Predictive Value 96.20% Negative Predictive Value 61.9% Disease Prevalence 84% Negative Appendectomy Rate 3.79% Table VI.

Evaluation of modified Alvarado score in diagnosis of acute appendicitis- a prospective study comparing the score with histopathology

Both had poor sensitivity and positive predictive values.

New test eyed for ruling out preterm delivery

The swab collection method was 55% sensitive, 63% specific, and had a positive predictive value of 62% and an overall test efficiency of 63%.

Home sample collection for HPV found feasible, specific

Sensitivity of Typhidot was 88.5% (CI 69.82-97.42), specificity was 81.56% (74.16-87.58), positive predictive value was 46.94% (32.54-61.720 and negative predictive value was 97.46% (92.74-99.44).

A comparative study of Typhidot test and Widal test with the culture-positive typhoid fever in children

"All of these had good positive predictive values, indicating that a pregnancy had a good chance of surviving," she said, "but the negative predictive values were not useful for clinical practice or research."

Bleeding + hCG levels may predict miscarriage

The assay had a specificity of 96%, a positive predictive value of 88%, a negative predictive value of 97%, and an accuracy rate of 95% compared with culture.

Point-of-care group B strep test gets approved

Overall, the positive predictive value ranged from 0% to 67%, and the negative predictive value ranged from 71% to 100%.

Medicare to cover test to identify ICD candidates

These tests should be sensitive enough to reject all contaminated donations but specific enough to achieve a strong positive predictive value and minimize unnecessary deferral of otherwise acceptable donors.

Usefulness of seminested polymerase chain reaction for screening blood donors at risk for malaria in Spain. (Letters)

* Positive predictive value = the percentage of correctly predicted difficult intubations as a proportion of all predicted difficult intubations.

Ratio of patient's height to thyromental distance (RHTMD) compared to thyromental distance for prediction of difficult intubation