To my knowledge there is no urine test for Crohn's disease. If that were so, then things like the capsule endoscopy [camera pill] to examine the small bowel would never had to be invented. If you have been having on and off gut issues for some time, you owe it to yourself to get a colonoscopy to check for inflammatory bowel disease. I let them tell me for 25 years that I had IBS. I was so sick of complaining about my bowel issues to the docs I stopped complaining. Then when all then other issues popped up, neuropathy, severe arthritis, EN, avascular necrosis of the hips - all caused by untreated Crohn's - my gut issues could no longer be ignored. I wish I had been more insistent.