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CD? ITB? How did your doctor diagnose

I was firstly diagnosed with UC one year ago. 3 months ago I was told it looked more like CD after my 4th scope and pathological tests. I have been taking Mesalazine for 10months. Recently I got fistula. A doctor recommended me to take a T-SPOT.TB to rule out the possibility of tuberculosis, and the result is positive. So now it may be CD or ITB. A really annoying situation.
I live in China now and am curious how your doctors give you reliable diagnosis. Any information will be appreciated.