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Babies in the neonatal intensive care unit often get multiple tests and treatments a day. Not all of them help, and some can hurt. Neonatologists have picked the five least likely to do good.
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Medicare now pays for some long-term smokers to get an annual test. These scans could save thousands of lives each year, but some doctors still worry risks outweigh benefits.
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Why not check bloodwork a few times a year as some celebrities advise? Because too much testing can lead to false positives (and abnormalities that don't threaten health) and to unnecessary treatment.