There isn't any single test that can diagnose Crohn's disease.This condition has many symptoms that are the same as those for other health problems. To make a diagnosis of Crohn's disease, your , Endoscopy tests are the most accurate way to diagnose Crohn’s disease and rule out other health problems. During an endoscopy, doctors use an endoscope—a long, flexible, narrow tube with a light and tiny camera on one end—to view inside the GI tract. Doctors may take biopsies during endoscopy tests to help diagnose Crohn’s disease., These tests won’t be used to diagnose Crohn’s disease alone. Stool collection is done either at home or at a lab, where the stool is placed into a sterile container and sent for testing. Some of the potential findings could include bacteria, blood, or parasites., , , .