If these are the tests by Prometheus labs they aren't 100% accurate. Determing whether one has UC or Crohn's is like assembling pieces of a puzzle. It's a matter of running lots of different tests, patients being honest about their symptoms, and seeing how meds affect the patient's condition. Even with all that ruling one of the IBDs out is always accurate. One can be diagnosed with UC but years later that diagnosis changes to Crohn's. What it shows is that the CD didn't manifest itself at the time of the original diagnosis.
dx proctitis in 1987
dx UC in 1991, was stable until 1998
1998 started prednisone, asacol, pentasa, nortriptylene, ativan, 6MP, rowasa enemas and suppositories, hydrocortisone enemas, tried the SCD diet, being a vegetarian, omega 3s, flax, pranic healing, yoga, acupuncture, probiotics
2000 lost all my B-12 stores and became anemic
2001 opted for j-pouch surgery- now living life med-free