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And digital caliper since it digital caliper uses radio waves rather than X-rays, Tapp's device is safe to use repeatedly. Radioactive tracer Body shape is known to be a risk indicator for heart disease and diabetes. So accurately quantifying fat distribution could help doctors suggest preventive measures to patients before problems arise. At the digital caliper moment, doctors estimate fat content from knowing body volume and water content. To a good approximation, says Tapp, anything that is not fat is water. The amount of water in the body is often measured by giving the subject a drink of water that contains a radioactive tracer. The level of tracer in the patient's urine after three hours reveals the total water volume. To find out a body's volume, subjects are weighed while totally submerged in water, and this is subtracted from their normal weight to give the weight of water displaced, and hence the subject's volume.
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