SPM – MCQ 78 – Negative predictive value

A diagnostic test for a particular disease has a sensitivity of 0.90 and a specificity of 0.80. A single test is applied to each subject in the population in which the diseased population is 30%. What is the probability that a person, negative to this test, has no disease?
a) Less than 50%
b) 70%
c) 95%
d) 72%

Correct answer : c) 95%

The probability that a person negative to this test has no disease signifies the Negative predictive value of the test.


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