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It is not a precise method; a reading of 25 percent body fat could mean an actual number as high as 28 or as low as 22–or worse with body temperature a badly trained technician. Some obesity scientists describe this method body temperature as a rip-off or "faux information." Widely available at health clubs; takes a few minutes Bioelectrical Impedence Test You lie down, a technician attaches electrodes to one hand and one foot, and a harmless radio-frequency pulse is run through the body to measure its water content. That number provides a body temperature guide to body fat with an error of 2 or 2 1/2 percentage points. But exercise and liquid intake before the test can skew results. Takes only a few minutes; found at health clubs and sports medicine clinics Immersion Test So far the "gold standard" of body-fat measurement, this test requires you to expel the air from your lungs and get dunked into a pool–half a dozen times. It under- or overestimates body fat by only 1 percentage point.
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