This definition appears somewhat frequently
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Samples in periodicals archive:
MUAC is the circumference of the left upper arm, measured at the mid-point between the tip of the shoulder and the tip of the elbow (olecranon process and the acromium).
1. Rural Remote Health. 2011;11(3):1754. Epub 2011 Aug 31. Use of mid-upper arm circumference in determining undernutrition and illness in rural adult Oraon men of...
Short Cuts to Measuring*** Measure full length of arm. (See #1) Look at arm. Measure circumference of any large area or area of concern for using the pump.