A local health department is introducing a new rapid diagnostic test for a seasonal viral illness. The lead epidemiologist is explaining the test's performance characteristics to the clinical staff. Match each test performance metric with its correct clinical interpretation.
- SensitivityThe likelihood that a patient with the viral illness will have a positive rapid test result.
- SpecificityThe likelihood that a healthy patient without the viral illness will have a negative rapid test result.
- Positive Predictive ValueThe likelihood that a patient who tests positive on the rapid test actually has the viral illness.
- Negative Predictive ValueThe likelihood that a patient who tests negative on the rapid test is truly free of the viral illness.
Cevap
Sensitivity matches with the likelihood of a positive test in a diseased patient. Specificity matches with the likelihood of a negative test in a healthy patient. Positive Predictive Value matches with the likelihood of disease given a positive test. Negative Predictive Value matches with the likelihood of no disease given a negative test.
Each performance metric has a distinct epidemiological definition. Sensitivity and specificity are inherent properties of the test itself, evaluating its accuracy in known diseased and healthy populations, respectively. Predictive values (PPV and NPV) provide the clinical probability of disease presence or absence based on the test results and are dependent on the disease prevalence in the tested population.
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Anahtar Kavram
Diagnostic and Screening Test Performance