A test that is positive in all patients who have the disease but also in some who do not have the disease is:
a. Sensitive
b. Specific
c. Precise
d. Reliable
ANS: A
Sensitivity (diagnostic) is defined by the number of people with the disease who test positive. In this case, all patients with the disease have a positive result, so the test is very sensitive. The test, however, is not specific because it is also positive in some people who do not have the disease. Reliability refers to the performance stability of a test over time. Precision evaluates reproducibility of the result if repeated multiple times on a specimen.
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