Mine was normal, except for one elevated inflammatory marker (CRP for me was up, but ESR was normal). I was negative for rheumatoid factor (only positive in rheumatoid arthritis), ANA (to rule out lupus), and a few other tests.
The arthritis associated with IBD (ankylosing spondylitis and related diseases) is what is called seronegative, meaning the blood tests are negative. Most people with AS are HLA-B27 positive, but the type that is associated with IBD has a lower association, 30-50%. So, there is no diagnostic blood test. They are mostly to rule out other diseases.
That does not mean that you cannot get these other types of arthritis just because you have UC, but if you do, they are independent of the UC and not associated with it.
Jan