I have, and also have a protein in my blood that is found in Multiple Myeloma. I see a hematologist who follows my levels, which have basically stayed the same over the past 3 years. It was a scary thing, at the beginning, especially having to have the bone marrow! At this point, I am considered to just have MGUS, which means my blood has the characteristics that could become Multiple Myeloma, BUT at this low elevated level that is not changing, it is NOT a cancer. Since my numbers have stayed the same, my hematologist believes that the elevation is probably caused by inflammation due to my mixed connective tissue disease. (lupus, RA, etc.) So... maybe yours is increased because of a Crohn's flare, which is also an autoimmune disease. (That is my hope!)
I hope that this is not too confusing. All I know, is that it is a very good thing that you had the bone marrow test and are having a CT. From my experience, hematologists are VERY smart and thorough! (My hematologist has actually told me a few times that he has an easy job, and that the autoimmune doctors, such as my rheumatologist, has a very hard job, because their diseases are not as clear cut as cancer.... Go figure.)
I am hoping that your elevated IMG is a due to a Crohn's flare, and not a cancer of the blood or bone marrow. Please let me know! I am sending good thoughts, best wishes, hugs, and prayers!