Two years ago, during an abdominal ultrasound, an incidental finding of a 2.7 mm gallbladder polyp was discovered. I was advised to repeat the ultrasound a year later. When I did so, the polyp measured 3.2 mm. The doctor mentioned that since the tests were conducted at different labs, this could be a machine error and that there was no need to worry. Should I consider getting another ultrasound this year? I have no symptoms or weight loss.