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14 Cards in this Set
- Front
- Back
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Sensitivity is defined as ...
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The ability of a test to detect DISEASE
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How is sensitivity mathematically measured?
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The number of true positives divided by the number of people with the disease (meaning true positives and false negatives)
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Tests with high sensitivity are used for ...
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"Disease screening.
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Specificity is defined as ...
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the ability of a test to detect nondisease (detect health)
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Mathematically, how is specificity derived?
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The number of true negatives divided by the number of people without the disease (true negatives plus false positives)
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Tests with high specificity are used for
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"disease confirmation.
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If the cut-off serum glucose value of a diagnosis of DM is set very low, no cases of diabetes will be missed, but many people withou the diabetes will be mislabeled as diabetes ie...
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"higher sensitivity
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If the cut-off is set very high, the diagnosis of diabetes will not be made in healthy people, but many cases of true diabetes will go undiagnosed ie..
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"lower sensitivity
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When a test is positive for the disease, the PPV measures how likely it is that the patient ...
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"actually has the disease.
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PPV is calculated by ...
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dividing the number of true positives by the number of people with a positive test.
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PPV depends on the ...
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prevalence of the disease.
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The higher the prevalence of a disease,
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the higher the PPV
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PPV depends also on the
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sensitivity and specificity of the test
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An overly sensitive test that gives more false positivies has
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a lower PPV
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