In April 2013, I went to the ER with abdominal pains that radiated to my back, reminiscent of pancreatitis. The blood work showed the pancreas was ok but my liver enzymes were high. I had an ERCP the next day that showed psc.
My ALP levels have been in the 300-500 range since, but the more important component of the Liver function test is the bilirubin levels. If they are above 1.0, I get worried; they are a better indicator of liver trouble than the ALP. When I have a blocked bile duct, the bilirubin will usually be above 2.5 or so, most commonly above 5.0.
MIN, be glad that if you have psc, your UC has been dealt with. You won't have to deal with both at the same time, and that would be a relief. I understand the disheartening part.