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.

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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.

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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.

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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