Posted 7/11/2017 5:13 PM (GMT 0)
We're not doctors, haven't seen your test results, and can only guess like you. It's possible you have UC and it's also possible you do not have it but I will differ to your gasteroenteroligist. I agree with getting a copy of your colonoscopy report, biopsy report, and the P-anca and ASCA test results you are talking about. The P-anca and ASCA test is pretty darn new, and therefore isn't as fully trusted as the results of a colonoscopy with biopsies.
A typical, storybook case of UC is a negative stool test for pathogenic causes, has a colonoscopy report that states inflammation began in the rectum and was distal (continuous) up the large intestine showing permanent architectural changes, and the biopsies confirm permanent architectural changes are present (things like a disrupted rather than orderly blood vessel pattern, crypt abscesses, and unusual cell features). Prior to my diagnosis I had a lot of blood in the toilet water with each and every BM, and blood is often what causes us to seek out a diagnosis. If the above does not sound like you, then it'd certainly cast doubt on a UC diagnosis.