I'm just amazed at how bad some GIs can be. Given your partner's age, weight loss and symptoms, Crohn's really should be one of the first thoughts. Yet an endoscopy can only see as far as the duodenum - that's basically nearly 20 feet of small bowel that wasn't looked at. As for "a biopsy", I'm not sure if you literally meant a single biopsy but if you did, one biospy isn't nearly enough. Usually lots of biopsies are taken during a colonoscopy, from different parts of the colon and the terminal ileum.
So yeah, good luck with the new GI. I hope they're better! (And don't be afraid to ask questions.)
Dx Crohn's in June 2000. (Yay )
Tried: 5-ASAs, azathioprine, 6MP, Remicade, methotrexate, Humira, diets.
1st surgery 20/2/13 - subtotal colectomy with end ileostomy.
2nd surgery 10/7/15 - ileorectal anastomosis. Stoma reversed and ileum connected to the rectum.
Current status: Chronic flare. Do I have any other kind?
Current meds: 50mg 6MP; Entyvio (started 3/11/16)