This doesn't seem to be much known about
, but high platelet count can be associated with IBD. High platelets = increased likelihood of blood clots.
High platelets was something I had, but never got a blood clot while staying in hospital. I had blood thinner injections in the stomach every day, though, and sometimes I had to wear those godawful stockings too. Also, I would get so bored and hungry sometimes, I'd wander off around the hospital quite a bit and forage for food.
Anyway, I do suspect the underlying cause is your UC! Speak to your doctor about
it; best of luck.
Obligatory link coming up:
www.ri.ccf.org/pathobio/delamotte/documents/Danese2004AmJGastro.pdf