Mid-upper arm circumference (MUAC)-for-age indicates body composition (upper arm fat and muscle) in adults and children when used with measurements of weight and height. MUAC measurements are compared with reference values by age and sex. Since the rate of change of arm circumference is slow, it cannot be used to assess growth or monitor the response to therapy.
AMA can be calculated from revised formulae which take account of errors resulting from the noncircular nature of muscle and the inclusion of nonskeletal muscle with MUAC and TSFT in cm:
For men: AMA
For women: AMA
MUAMC and AMA can be compared with reference values by age and sex. AMA cannot be used to monitor change in muscle stores because of the problems in making this measurement. The ratio of AMA to total body muscle mass changes with age and certain diseases.
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