I cannot understand how gallstones can produce a raised bilirubin in the urine without producing jaundice. If the gall stones are confined to the gaal bladder, then there should be no build up of bilirubin. If however the gallstone have migrated into the common bile duct, then there would be a build up of bilirubin but also you would be jaundiced and I assum that you are not. My suggestion would be to re-test your urine for bilirubin and if it is still positve, return to your GP for more sensitive and diagnostic liver function tests.