QuestionSBA
QuestionChoice
This would represent the sensitivity of the test. In other words, the proportion of people with the disease with a positive test result.
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c
21%
QuestionChoice
This would represent the negative predictive value. This describes the proportion of people with a negative test result who truly do not have the disease.
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b
54%
QuestionChoice
The specificity of a test is the proportion of people without the disease who test negative. In this example that is 470 out of 500 total patients without the disease, or 94%.
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a
94%
QuestionChoice
This represents the false positive rate. Which is the proportion of those without the condition who will test positive. It is calculated with this equation: false positive rate = 1 - specificity
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e
6%
QuestionChoice
This would represent the positive predictive value or the proportion of people with a positive test result who actually have the disease.
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d
78%
Concept
Chapter
2693
4325
Evaluation of a diagnostic test
Topic
178
Medical Statistics
17945
Prostate-specific antigen (PSA) can be used to help identify potential cases of prostate cancer.

| PSA test result | Patients with prostate cancer | Patients without prostate cancer |
| --- | --- | --- |
| Positive | 105 | 30 |
| Negative | 395 | 470 |

Using the information in the table, what is the specificity of the PSA test?
a