My ALT and AST levels are very high and when retested 3-6 months later they go down and then the next time go up again. This roller coaster has been going on for a couple of years consistently. I have Ulcerative Colitis (taking the drug  Lialda) and Drs, are saying probably Autoimmune Hepatitis. Two years ago they were talking about my Gall Bladder but not recently. They want me to have a liver biopsy and to probably go on Imuran. I remember 10 years ago or more being told I had elevated liver enzymes. But nothing was done then because the next test was normal. Concerned and confused. Do you think I should have a liver biopsy?