Prado et al reported an equation the can estimate a patient's fat-free mass from the area of the skeletal muscle at L3 as seen on transverse CT images. The authors are from the University of Alberta in Edmonton and the Cross Cancer Institute.


(1) skeletal muscle area at L3 in square cm on transverse CT of the abdomen


total fat-free mass in kilograms =

= (0.3 * (skeletal muscle area)) + 6.06


The mean absolute residual error of the estimates was 2.94 kg

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