I know when I was on Imuran, the doctor ran liver tests all the time. I'm not sure if that would apply to remicade or other medications, but it's possible. The liver seems to be sensitive to biologics, which is why they base the amount of Imuran you take in comparison to how much you weigh, etc. I wonder if one of the meds you're on is causing some sort of issue. Good luck!
Currently taking: Humira 40mg/every other week, Zoloft 50 mg/day, vitamins and supplements
Have taken: Cyclosporine, Pentasa/Asacol, Aciphex, Imuran, Sulfasalizine, Cipro & Flagyl, Prednisone, various pain med's, Xanax
Surgeries: Appendectomy 2001, Ileocecotomy 2007