i have multiple gall stones,AGONY! and they are removing mine with my bypass,if you have had probs you should tell your surgeon,as drastic weight lose can make them worse and create more stones,but when i chatted to my surgeon he said if there were signs of gallstones in his patients when he was operating ,he would remove the gall bladder,with prior consent ,he also asked my permission to change from bypass to sleeve if there are complications ,i def would check with your surgeon so he can arange scans to check you before surgery,good luck with everything x x