A test can have both a positive and a negative predictive value (NPV). All the following elements are needed to compute the positive and NPV of a test, except
A) sensitivity of a test.
B) specificity of a test.
C) type of disease being tested.
D) prevalence of the disease being tested.

Question

Quizplus · Accepted Answer

The type of disease being tested is not necessary to compute the positive and negative predictive value of a test. The sensitivity and specificity of a test determine the accuracy of the test, while the prevalence of the disease being tested determines the probability of true positive and true negative results.

A Test Can Have Both a Positive and a Negative