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Commentary: Accuracy of Computed Tomographic Angiography and Magnetic Resonance Angiography for Diagnosing Renal Artery Stenosis
- Harold C. Sox, MD, Editor
The principal claim of this carefully done study is that CTA and MRA miss too many cases of renal artery stenosis to be the tests of choice. The purpose of this commentary is to test this claim by translating the sensitivity and specificity into a term that clinicians can use for decision making: the likelihood ratio. Remember that the post-test odds equals the pretest odds times the likelihood ratio. The likelihood ratio, therefore, tells us how much a test result changes the odds of disease. The Table in …
