Mid-upper arm muscle circumference (MUAMC) and upper arm muscle area (AMA) are estimates of upper arm muscle and, therefore, body composition. They can be used as indicators of muscle mass and protein stores. Both MUAMC and AMA are calculated from measurements of MUAC and TSFT on the mistaken assumption that the arm is cylindrical, the subcutaneous fat is equally distributed, the bone atrophies in proportion to muscle wastage in malnutrition, and the cross-sections of neurovascular tissue and bone are small. The formula, with MUAC and TSFT in mm, is:
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