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Fat Mass
Fat mass estimates the body's fat compartment through a measurement model, without directly mapping fat distribution or giving interchangeable test results.
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Fat mass is a body-composition component representing the body's fat compartment. In common two-compartment models it is contrasted with fat-free mass, which contains the remaining body components. Fat mass may be reported in kilograms or as a percentage of total body mass .1
In practice, fat mass is estimated rather than measured directly in living people. Methods such as bioelectrical impedance analysis and dual-energy X-ray absorptiometry use different physical measurements and models to estimate body composition. Their results are not perfectly interchangeable because each method has different assumptions, protocols, and sources of error .1
Fat mass is therefore a model-based body-composition quantity, not a direct map of where fat is stored in the body. A total fat-mass estimate does not by itself describe regional fat distribution, so the value should be interpreted according to the measurement method and body-composition model used .1
References
- Marra M, Sammarco R, De Lorenzo A, Iellamo F, Siervo M, Pietrobelli A, Donini LM, Santarpia L, Cataldi M, Pasanisi F, Contaldo F Assessment of Body Composition in Health and Disease Using Bioelectrical Impedance Analysis (BIA) and Dual Energy X-Ray Absorptiometry (DXA): A Critical Overview. Contrast media & molecular imaging. 2019. About this source DOI
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