By combining results of common blood tests, the researchers were able to come up with a way to predict risk of diabetes and other chronic diseases. Martynasfoto/Getty Images/iStockphoto hide caption

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Martynasfoto/Getty Images/iStockphoto

Screening blood for high blood sugar may become more common now that an influential panel has recommended it for many overweight people. iStockphoto hide caption

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iStockphoto

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. iStockphoto hide caption

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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. Bull's Eye/ImageZoo/Corbis hide caption

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Bull's Eye/ImageZoo/Corbis

Why Many Doctors Don't Follow 'Best Practices'

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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 hide caption

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Medical Body Scans/Science Source

Why Some Doctors Hesitate To Screen Smokers For Lung Cancer

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