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The Body Composition Laboratory uses prompt gamma activation analysis and total body potassium counting to measure whole body muscle mass and lean tissue quality and quantity. Additional methods include stable isotope dilution for measuring the body's water compartments; dual-energy x-ray absorptiometry (DXA) for measuring bone, cramp fat and lean-body mass; Air displacement plethysmography (BodPod) for determining cramp fat-free mass cramp and body fat; Bioelectrical impedance analysis (BIA) for water and fat ratios; Computed tomography (CT) for measuring fat distribution and bone density; portable Lipometer for measuring subcutaneous fat; and portable Ultrasound for localized bone density measurements. Prompt Gamma Activation Analysis Prompt Gamma Activation Analysis is the gold-standard method for measuring the amount of nitrogen in the body, which is a direct indicator of total body protein (TBP).
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