It's pretty much one or the other...I don't think there's a definitive blood test for either. You might have Crohn's Colitis.
I don't think that the CT would necessarily show the inflammation as would a c-scope. Inflammation can be in other parts of your body as well.
When was your last c-scope?
*Heather* Status..Asacol (3 x2 daily); flaring /Dec 22, tapered to every 3rd nite
~diagnosed January 1989 UC (proctosigmoiditis)
~Bentylol (dicyclomine) 20mg as needed; Ranitidine (reflux); Effexor XR 75mg(depression); Pulmicort/Airomir (asthma)
~vitamins/minerals/supplements; Probiotics....(Natural Factors Protec, Primadophilus Reuteri Pearls, Natural Factors Ultimate). @ bedtime
~various digestive enzymes as needed; started Omega 3
~URSO for PSC (or PBC) 500mg X 2 daily (LFTs back to NORMAL!!)
My doc's logic.. "TREAT (FROM)BOTH ENDS" worth it !!!