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Originally developed to measure bone density, DEXA determines not just your body-fat percentage but also the location of your fat (abdominal fat poses a greater compatible health compatible risk than does fat in the hips and thighs). Accuracy The margin of error is 2-3 percentage points. DEXA is useful for people with below- or above-average bone density because it's the only method that calculates bone mass and soft-tissue mass separately. The other methods compatible lump both types of lean mass together, so a person with denser bones may appear leaner than she actually is and vice versa. Cost About $100 Where you can get tested At hospitals and some doctors' offices, although many facilities don't have the software to use the DEXA machine for body-fat testing. My score 22 percent underwater weighing How this method works Sitting on a scale in a tank of water, you blow out as much air as possible, dunk underwater, then expel even more air. Your weight underwater is used to calculate your body density.
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