Crohn’s disease is a type of inflammatory bowel disease. It is a chronic condition that can cause inflammation anywhere in the gastrointestinal (GI) tract, which runs from the mouth to the anus. However, this condition most often affects the small intestine. There is no single test to diagnose Crohn’s disease. A doctor might need to order a few different tests to confirm a diagnosis of this condition. A doctor will often order an assortment of tests to help diagnose Crohn’s disease. These tests may include the following: Doctors may conduct a blood test to search for signs of infection, anemia, or inflammation relating to Crohn’s disease. A doctor might order an imaging test, such as an X-ray, CT scan, or MRI scan, to get a picture of the person’s internal structures. A CT or MRI scan might require the person to drink a contrast solution or receive contrast intravenously. Doctors often use a special imaging test called an upper GI series to visualize the upper GI tract more clearly. This test involves the use of X-rays, fluoroscopy, and barium. A person will drink the barium solution, and the radiologist will then track its movement through the uppe...