The testing could be as simple as drawing a blood sample. It also could be a bit more involved, like a special X-ray or an electrocardiogram.
Some tests are even more complicated.
These involve inserting a scope into the stomach or colon or placing a catheter into an artery and injecting dye. Here are some ideas to help you better understand what to expect. Your doctor orders diagnostic tests to confirm a diagnosis. There are a number of different types of diagnostic tests and they vary in their degree of complexity. Screening Tests Screening tests are used to look for potential problems before you have any symptoms.