MCQ MAHE 2000 PSM Answer 11
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The basic idea of diagnostic test interpretation is to calculate the probability a patient has a disease under consideration given a certain test result. A 2 by 2 table is used as a mneumonic device. Be sure to label the table with the test results on the left side and the disease status on top as shown here:
| Disease present | Disease absent | |
| Test positive | (A)True positives | (B) False positives |
| Test negative | (C) False negative | (D) True negatives |
Predictive value of a negative test is the proportion of patients with negative tests who do not have disease. In probability notation: (D-|T-) = TN / (TN+FN) = D/(C+D). It measures how well the test rules out disease. Notice that this is not the same as posttest probability of disease given a negative test which is one minus the predicitive value of a negative test.
Tags: MCQ, PSM, Negative Predictive Value
Category: MAHE 2000 MCQs
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