The MUAC measure is a long strip with a series of colour bands. When measured properly against a bare upper arm, the gauge provides a number and indicates the colour range
125-134mm (risk of malnutrition)
110-124mm (moderate malnutrition)
<110mm (severe malnutrition and threat of death)
From the MSF Refugee Handbook
Screening for malnutrition
"It is essential to detect children with nutritional problems early on as malnutrition is a major cause of mortality among children. For screening purposes, it is recommended to use the mid-upper arm circumference measure (MUAC), which is a quick way of identifying children at risk. Referral to feeding programmes must be organised in line with MUAC cut-off points and the criteria selected. The time and resources devoted to malnutrition will depend on the degree to which malnutrition is a cause of mortality."