How do i know if i have chrons disease?

Crohn's diagnosis: The symptoms from crohn's range from very severe to very mild. If your primary doctor suspects crohn's they'll usually get some basic blood tests - cbc, esr, chemistry panel, liver tests, crp, but then most likely refer you to a GI specialist for a colonoscopy. The doctor will look for ulcerations, other signs of inflammation, and will do a biopsy, which will help with the diagnosis of crohn's.