Bladder scans are indicated in several scenarios: 1. Suspected Urinary Retention: When a patient shows symptoms like difficulty urinating, a weak urine stream, or a feeling of incomplete bladder emptying. 2. Postoperative Monitoring: To assess bladder function and prevent complications after surgeries involving the lower abdomen or pelvis. 3. Catheter Removal: To determine if a patient can void adequately without a catheter. 4. Chronic Conditions: For patients with conditions like spinal cord injuries, multiple sclerosis, or enlarged prostate that affect bladder function. 5. Urinary Incontinence: To evaluate the underlying causes and effectiveness of treatment.