Updates on the diagnostic workup for IBD, emphasizing the "immigration effect" as proof of environmental triggers. We clarify phenotypic mimics to avoid surgical disasters, such as distinguishing "backwash ileitis" and the "cecal patch" from Crohn's disease. The session covers the crucial Rutgeerts score for post-op recurrence (treating an i2 score), the utility of fecal calprotectin (<50 to rule out inflammation), and the new terminology replacing DALM: visible vs. invisible dysplasia.