Chapter 4: Diagnosis Part 1: accuracy of individual tests
At the end of this chapter, you will be able to:
- Define sensitivity and specificity, and learn when this information can be clinically useful.
- Understand the relationship between pretest probability, post-test probability, and predictive value, and apply this to the interpretation of diagnostic tests.
- Define likelihood ratios and apply them to the selection of diagnostic tests, including polytomous tests..
- Understand why some tests are better at ruling in or ruling out disease but not both.
- Understand factors other than accuracy that impact selection of diagnostic tests (e.g. cost, availability, impact on patient oriented outcomes).
- Interpret and use receiver operating characteristic curves as a way to evaluate the accuracy of one or more diagnostic tests