A broad generalization, it depends on the test. I was trying merely to make a point that the intuitive model (you want to know if you are sick, you do a test an

A broad generalization, it depends on the test. I was trying merely to make a point that the intuitive model (you want to know if you are sick, you do a test and you get a result) is not how medicine works. I mixed up CT Scan with MRI, corrected in another comment.