Specificity of an instrument used for diagnosis refers to what?
a. Its ability to detect error
b. Its ability to detect the presence of a condition or illness
c. Its ability to detect the absence of a condition or illness
d. Its true positives minus its false negatives
ANS: C
Specificity of a screening or diagnostic test is the proportion of patients without the disease who have a negative test result or true negative. A test with high specificity is very good at identifying the patient without any disease.
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