The Centers for Disease Control and Prevention estimates that 86 million Americans over age 20 have abnormal blood sugar levels. Over the long run, that can seriously damage the eyes, nerves, kidneys and blood vessels.
Science-based guidelines say there's no benefit to getting an EKG of heart activity before routine cataract surgery — even if the patient is old. But most doctors order such tests anyway.
This spiral CT image of the chest shows a large malignant mass (purple) in one lung. A conventional chest X-ray could have missed this tumor, radiologists say.
Medical Body Scans/Science Source