If a test standard is valid and the criteria for discriminating a positive from a negative test remain constant, what else will remain constant?
1. Sensitivity
2. Specificity
3. Reliability
4. Accuracy
Sensitivity
Rationale: If the standard is a valid one, and as long as the criteria for discriminating a positive from a negative test remain constant, sensitivity will be constant. Sensitivity describes the ability of a test to identify clients with disease. It may be calculated by dividing the number of true positive tests by the sum of true positives plus false negatives. Specificity is calculated by dividing the number of true negatives in the population by the sum of true negatives plus false positives. Thus, specificity describes the frequency with which the test is normal in subjects who are free of disease. Reliability and accuracy are measured with different data.
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