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It is very reliable, repeatable, safe and presents little burden to the gas production subject. But the cost of equipment is very high, and requires a trained technician--limiting DEXAs availability to laboratories and clinical facilities. Another method that is gaining wide support by medical and fitness experts is bioelectrical gas production impedance analysis (BIA): BIA--a safe, low-level electrical signal is passed through the body, and body fat percentage is calculated based on the amount of impedance as the current flows gas production from one point to another. The signal passes much faster through lean muscle than fat because muscle contains 70-75% of the body's water (fat contains almost no water). BIA is most consistent and reliable if you are properly hydrated and if you wait three hours after eating or exercise before the measurement.
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