Esp with the gallbladder, assuming it isn't broken is not enough. They need to actually test it. Mine also didn't show stones or sludge, but my HIDA scan was the clincher. The down side was I had 2 surgeries in a 6 month time frame and could have avoided ONE of those. Every time you go under the knife, you risk possible complications and while gall bladder surgery is routinely easy, doesn't mean it is all the time...ask that poor teen who died from a SIMPLE wisdom tooth removal. The piece of paper you sign for ALL surgery does list DEATH as a possible consequence. Seldom happens for "routine" procedures but it can.
If it were me, I would have had mine out at one go.
Back in Feb, I saw a local to me bariatric surgeon cause my PCP was getting weird about doing our labs. Now this office was RUMORED to be doing the DS so my husband and I both went and I flat out asked...yes, the surgeon was aware of the DS and how to do it, he chose to not do it in his practice. But HE KNEW IT. And he said, according to all the literature on the DS and everything he read on it as to how it was done, the gallbladder was also to be removed due to a high percentage of failure of that organ in the following months. He was honestly floored when he found out neither of our surgeons had done it during the DS. He agreed I would have avoided a second operation if I had and got my husband in for a HIDA scan to check his as well since my husband still has his.