No, urgent surgery is not required for an asymptomatic 12 mm gallbladder stone. In medical practice, the standard protocol for completely asymptomatic (silent) gallstones of this size is expectant management (watchful waiting) rather than immediate surgery. Most people with asymptomatic gallstones never develop symptoms or complications. Only about 1% to 2% per year progress to symptomatic disease (such as biliary colic). In your case:-- 1. Routine Monitoring: Keep the ultrasound report on file and repeat imaging only if advised by a physician or if new symptoms develop. 2. Dietary Adjustments: Maintain a balanced diet, avoid sudden extreme low-calorie crash diets, and moderate high-fat or greasy meals to minimize gallbladder contractions. 3. Regular follow-up with a gastroenterologist.